Anderson | Axelsson | Ballinger | Bodschwinna | Cano |Coveiro | Danilov | Dangler | Durman | Eaton | Finozhenok | Forbes | Fougeron | Gostin | Grobstich | Gusev | Kenn | Knotko | Kruppa | Kuechler | Kuvshinov | Maiorov | Melo | Moore | Morelli | Nohara | Oleynik | Pacher | Ptacek | Samidoost | Santanen | Saridis | Steven | Strasser | Stolyarov | Taura | Vonck| Vuori


Göran Axelsson

I was born in Sweden in 1966, still alive and living in Umea in the northern part of Sweden, so it is definitely Sweden.
I have always been interested in mathematics, my interest for prime numbers started when I was about 15 years. When I got my first computer with a floppy drive I filled a number of disks with primes until I got bored and started with fractals instead.
When I started at the university (civil engineering in physics) I also got back into prime numbers by writing a Lucas-Lehmer program for Mersenne primes. When I later learned about Prime95 I jumped onto that project and is currently running six computers for GIMPS. I played around with Proth about a year ago and wrote a sieving program that never got to a finished state. Tried to factor some Fermat-numbers but lack of spare time and some realism :-) killed that project too. I didn't believe my eyes today when I started proth on the only number I got this morning (was retrieved factor for F91213). When it started to check for coefficients of Fermat numbers I just stood there and watched. This is surely a boost of my math interest. Now I just have to find a Mersenne prime to get the collection complete! :-)


Ray Ballinger

I was born in Washington State, USA June 23, 1953. I attended undergraduate college at the University of South Florida and Medical School at the University of Miami. While an undergraduate, I received the Dr. Sylvan Myers Award for Highest Achievement in Physics and Mathematics by Pre-Medical Students. After a few years in private-practice Diagnostic Radiology, I went to the University of Florida where I studied Medical Physics, specifically magnetic resonance spectroscopy.
For the last several years I have been working at an University-affiliated hospital and enjoying time with my wife and two children, Christopher and Jennifer, who are 10 y/o and 9 y/o respectively. My hobbies include working on distributed prime number projects, jogging, swimming and hiking.

Marko Bodschwinna

I have a PIII 500 and a Cel433at545. These computers run 10-18 hours per day at differend projects. It is planned to upgrade, especially the Celeron. Found divisor for F48. I live in Germany.


Alfredo Cano

I'm from Madrid, Spain. I have a degree in Physics and currently work in a consultancy firm, also in Madrid. I'm interested in the field of prime numbers.


Vasily Danilov

Born in May, 1957 I have completed Moscow Institute of Railway Transport in 1980. Now I work as a programmer in CIT Trans (Centre of information technologies on a railway transport). I am interested in prime numbers, Mersenne numbers, Collatz problem, Queens problem and Knight tour.


Leonid Durman

I was born October,21 1975 in Stavropol, Russia. I have completed a technical university. My hobby then and now is programming and calculus. I starteed calculating the digits of Pi when I was at school, for this purpose using the old computer Z80. Aspiring to calculate it more and faster, I have studied many languages and compilers. Beyond a certain point supercomputers are required to calculate the number Pi, therefore competitions are senseless.
Now I try to refine the distributed project for search of divisors of Fermat numbers. The usual household computers can successfully take part in this competition. Today I work as a programmer in an accounting department. I am married and raising a young daughter.


Michael Eaton

My full name is Michael Richard Eaton. I was born in 1986 in the USA. I have a B.S. in Computer Science and I work as a professional software developer.
I have had a fascination with prime numbers and integer factorization since a very young age. I first began searching for Fermat factors in 2003.
I was only age 18 when I made my first two fermat factor discoveries in February 2005. I enjoy the thrill of the hunt and I feel like its a way to help uncover the little secrets of the universe.

Dmitry Finozhenok

I want to take part in development either debugging of a client or a server part. I know assembler, and some C ++. I can help with design or scripts by a part of the Web-server. (ASP, SQL, DHTML, CSS, VBScript, JavaScript).


Tony Forbes

(Author of program MFAC which has found factor for F31)

I was born in 1944 and I live in Kingston-upon Thames, England. I worked for British Rail for 25 years until the Computer Department was sold to a private company in 1998, and about a year later I took early retirement. I am now a 'Gentleman of Leisure' and I am therefore able to persue full-time my hobby of Mathematics (number theory and combinatorics). I am the editor of 'M500', a mathematics magazine for Open University students & staff. With Harvey Dubner and Paul Zimmermann, Michel Mizony and Nik Lygeros we discovered 10 consecutive primes in arithmetic progression see TEN CONSECUTIVE PRIMES IN ARITHMETIC PROGRESSION. I am married (since 1973), and we have three daughters, Tamsin, Kim, Zoe. Apart from mathematics, I am interested in classical music (especially opera) and I play 'bridge' (at a fairly low level).
Tony Forbes is coordinating a search for a factor of MM61 (2^(2^61-1)-1). This is the smallest Mersenne number with a Mersenne prime exponent whose primality status is unknown.

Webpages for MM61 and MFAC:

Jim Fougeron

I was born in 1966 and live in central USA (Omaha Nebraska). I work for a satellite broadcast company. I became interested in cryptography/cryptanalysis in the late 80's, and more recently have become interested in the search for large prime numbers. I am much more of a computer engineer than a mathematics guru, and I enjoy writing and enhancing code.
I am one of the main contributors to the OpenPFGW project, and I recently added Generalized Fermat divisibility testing to PFGW. I am also in the process of writing a Win32 GUI around the PFGW program. There currently is a version of WinPFGW (the GUI) available over the net which does enhance this search. I have also written several "trial factoring" programs which quickly eliminate composite candidates from a list of numbers. The most recent has been designed specifically for large number Fermat type searches. It is called FermFact. I have not quite finished it, but when it is finished I will also make this program available. FermFact works very similar to another great trial factoring program, NewPGen by Paul Jobling, and borrows a little code from an older version of Paul's utility. The difference between NewPGen and FermFact is that FermFact allows you to factor a rectangle of k's and n's at the same time.
The OpenPFGW software (get the most recent development version), and the WinPFGW GUI program can be found at Note that when FermFact is released, it will also be contained within this directory.


Gary Gostin

I was born August 10, 1954 in Chattanooga, Tennessee, USA. I attended Vanderbilt University, receiving undergraduate degrees in Electrical Engineering and Computer Science. I later received a masters degree in Computer Engineering from the University of Illinois. While there, I became interested in factoring Fermat numbers, discovering my first factor (F17) using a CDC 7600 computer. Since then I have used a variety of machines to search for Fermat factors including a home-made computer based on the Motorola 6800 processor! Over the years I have written several different programs for factoring Fermat numbers which I have been able to run on prototype systems at work. From 1983 to 1995 I worked at Convex Computer Corp designing mini super computers. Since then I worked at Hewlett Packard and then Hewlett Packard Enterprise as a systems architect, designing large enterprise and HPC systems. I am married and have two sons and two granddaughters.


Peter Grobstich

Prof. Peter Grobstich Department for eduacation of Civil Engeneers, subject Mathematics and Informatics University of Applied Sciences of Neubrandenburg/Germany


Gennady Gusev

My full name is Gennady Nickolaevich Gusev. I was born on September, 15, 1954 in Yaroslavl, Russia. I graduated from Yaroslavl State University, the Faculty of Mathematics, majoring in Applied Mathematics in 1977. That year I moved to Rybinsk (the town is situated in Yaroslavl Region, 80 km from Yaroslavl) and began working for the plant (now JSC "Rybinsk Motors"). I was working as a programmer, system programmer for mainframe for about 10 year, then for PC. Now I'm the head of the software development department.
My hobby is computational number theory. My results are:
Computed A023052 and A061558
Discovered Fermat factor 99*2^83863+1 of F83861 using Ives Gallot's program 'Proth.exe'
Found new sequences for Puzzle 11 in
I'm married and having 2 daughters, Anna and Catherine. The latter is an undergraduate student, also majoring in Applied Mathematics and Computer Science.


Mischa Kenn

I spent about 130 CPU Pentium-90 years on the GIMPS project. In fact, I was one of the very first who started in early 1996, when there where only about 10 people participating. Interests: Many sports on a competitive level. Number theory. Classical piano. Participating in an Internet project for finding Mersenne primes. Railway modelling, bridge, numismatism. Dipl. Ing. Dr. techn. Speech Recognition Technologist at Philips Speech Processing. Austria.


Vladimir Knotko

I am a student at the Faculty of Mechanics and Mathematics MSU (Moscow State University). I am interesting in number theory, intelligence systems (artificial intelligence), cryptography.


Alexander Kruppa

Alex has found a factor for F31. He has written:
I started my own search late last year, before I had ever heard of Fermatsearch, and I began searching from zero, or rather 1*233+1 . I worked my way up to 2310*109*233+1 on my own computer and infrequently on machines available on the Technical University of Munich. At that point I got permission to use 5 Athlon 1GHz permanently at the Uni, which accelerated my search greatly, ultimately resulting in the discovery of the factor.
I have spent about 100000 (hundred thousand) Pentium II 400Mhz cpu hours on various factoring projects (M727, F14, P773 and others) and came up empty each and every time. The F31 factor more than makes up for the many boring hours of factoring in vain, and it proves that if you keep trying, odds are you'll succeed sometime. Persistence is the key.


Tom Kuechler

I live in St. Louis, Missouri, USA. I am a chemist and have worked on the Riesel search coordinated by Ballinger and Keller for about two years. The Fermat factor search looks very interesting.


Andrey Kuvshinov

I have ended a physical and mathematical speciality in Belgorod University, now I teach to mathematicians in школе+обучаюсь without seeing on a speciality " the Software of computer facilities and automized systems.


Sergei Maiorov

Born in December 1969 in the Khimki-town, Moscow Region, Russia.
I studied at the Moscow Aviation Institute in 1987-1993.
Now I am a programmer in TVZAVR Ltd.
Interested in the synthesis of theories of graphs and matrices.
Groping approaches in the field of symmetry and harmony.


Nestor Sergio de Araujo Melo

I was born in Sao Paulo, Brazil, July 13 1971. A firm believer that we shouldn't waste any CPU cycle, I joined SETI@home, even before the client program was released. After thinking on the likelihood of finding an alien civilization, I changed to something more feasible: the Great Internet Mersenne Prime Search but even Mersenne primes are hard to find, so I decided to try something a little easier while having more control on what exactly I was doing. Thus I turned my attention to Proth primes and had a glimpse of the beauty of divisibility properties with respect to Fermat and generalized Fermat numbers. Finder of quite a few generalized Fermat divisors and discoverer of two Fermat divisors: 357*235567+1 Divides Fermat F(35563) and 159*2142462+1 Divides Fermat F(142460).

Prover code at Prime Pages: g97

Phil Moore

Mathematics Division. Lane Community College, Eugene, Oregon. My goal is to find out if there are any other factors of Fermat numbers less than the larger factor of F7: 5704689200685129054721. I have been doing ECM factoring with George Woltman's program for the past 1.5 years on F19 through F23, but will need more memory even to try F24, so I thought that using Fermat.exe program will complement this work nicely.


Luigi Morelli

I was born in Rome, Italy on March 7th, 1962. My inspiration and imagination have soon been caught from science, and since I was a boy my studies led me through the (too often) waste land of technology. When I was 16 I faced computers' world, programming games in Assembly language on Commodore 64. It has been on that (slow) machine that I firstly met numerical analisys, and I loved the way a computer could be used to speed up slow and time consuming calculations.
My life went on, and so did my passion for Mathematics and Computer Science: I started working as a mainframe operator, then I became a programmer, an analyst, and finally a system and network manager. Now I collected different skills: I can use up to seven different programming languages and as many operative systems, but the call for undoscovered lands is still strong.
This is the reason why I decided, during April 1997 to join GIMPS: the unused spare cycles of my computers' CPUs were worth a redemption. I got interested in other distributed computational projects as well, and wrote some factrizaton programs. At the moment I maintain the, and the websites. I strongly believe in the use of spare CPU cycles to help distributed scientific projects and this is the second most important reason why I am here.
The first, of course, is the need for knowledge. Our great poet, dante Alighieri, said about the Man: "Fatti non foste a viver come bruti, - ma per seguir virtute e conoscenza", that is "You were not created to live as beasts, but instead to follow the path of virtue and knowledge".


Takahiro Nohara

I was born in 1969, live in Japan. I've been major in chemical. My occupation is engineer of semiconductor process. Mathematics was rather poor but intersted in it. Above all, I was poor at English in my high school age and teacher scolded me sometimes.
I've searched the dividors of Fermat number at larger 'n' with Proth.exe. Often use NewPGen.exe also. I found 8247.2^9324+1 divides F9322 independently in November 1999. But Kerchner found it 12 days earlier. This fact was noticed to me by Wilfrid Keller's reply.


Anton Oleynik

I, Oleynik Anton Petrovich, originally from Samara, was born on July 16th in 1972. In 1994 successfully graduated from Samara State Technical University majoring in System Engineering. Started carreer in the bank the same year. Have been working as a Automation Office manager since 1997. Took part in some distributed computer engineering projects. Presently reside in the city of Blagoveschensk (Far East).
Hobbies - computers, Internet. While having spare time enjoy watching black action movies, such as "Lock, Stock and Two Smoking Barrels". Married. Have a two-year-old son named Ilya.


Payam Samidoost

I was born 21 Jan 1969 in BandarAnzali (previousely known as BandarPahlavi), a beautiful port at the north of Iran, near the Caspean sea.
In 1985 I entered the Iran university of science and technology. I get my BSc in 1991 and MSc in 1994, both in pure mathematics.
In 1990 I married and now have a 9 years old daughter named Pegah - means dawn. My wife's name is Mahnaz Fattahi.
My job is computer programming. Currently I am working in Atomic Energy Organization of Iran as a computer programmer. I can write programs in C/C++, Java and assembly language of both IBM and Sun compatible machines.
My main interest is computational mathematics. My hobby is prime numbers. I have already found a 100001 digit prime number 1271*2^332185+1. This prime was the 25th greatest when was found.
I am currently working on Sierpinski problem with k=4847 and recently searching for a Fermat trial divisor using Durman's FERMAT program.
I need to continue my educations in Mathematics or Computer science, preferably in a number crunching related field, outside Iran. Can anybody help me?


Jani Santanen

I use three computers to do distributed computing: PIII 600Mhz 24 hours/day (My work computer), AMD 333Mhz about 1-3 hours/day (My own home computer),PII 233Mhz about 4-8 hours/day (My work laptop). I have no permission to use other computers here in work. So I can use only these three computer to calculating. I am from Finland.


Pavlos Saridis

I was born in Kavala,Greece 25 November 1980.I am currently attending the second year of undergraduate course in mathematics.My mathematical interests include number theory, cryptography, set theory and Logic.I also enjoy literature, languages,history,especially ancient or medieval history,going to the cinema and internet. In the proth searches,i search for fermat divisors but found so far none(been too close..) I hope that some day all the knowledge in mathematics,physics and all science is absolutely devoted for the Good of mankind (Depleted Uranium? Humanitarian War? Balkans=Dump for X's nuclear waste?) I am just adding these stuff because my region the Balkans has suffered a great many bad things and my hope is that finally peace will be established.


Harvey Steven


Dmitry Stolyarov

The engineer - programmer. Works in research institute of nuclear physics of the Moscow State University.


Peter Strasser

I was born in Austria (Vienna) and live since my birth in Lower Austria, not so far from Vienna. When I was 10, I read the first time about Mersenne Numbers and Perfect Numbers. This impressed me very much. My first comp. was a BASF with three 5 1/4"-floppies, no HD and a Zilog Z 80 processor. 15 (!!) MOD-calculations per sec. I started to try to find Fermat Factors in 2009. In 2010 I found my first (With a 100% self-written MATHEMATICA-program). In December 2018 I found my second Fermat factor, in January 2019 the third. Both factors were found with the program mmff written by George Woltman.
I am chemist. My main hobbies are: photography, music (play alto- and tenor-sax), chess, being in nature, reading good books. The (not soo new) picture was made one day after I climbed the top of Matterhorn (4478 m).


Tadashi Taura

Tadashi Taura works in a softwarehouse and lives в Yokohama Downtown with his wife and son. He is advised by H. Wada, a prof at Sophia University In Tokyo. Gathers various computer facilities. Creates own programs for Fermat Search.


Asko Vuori

I was born in Finland in 1965. I have been with computers since 1982 and Vic20. Somewhere in mid 80's I read text about F1945/(5*21947+1). Then I start writing 6502 machine code program to do that. Program was slow 4hour 21min, but it works. Sadly I don't have Vic20 any more, it would be fun to test it's limits. 1993 I buy 486 and of course change old program to 80x86 format. On april this year 2005 (after very long saving) I buy new laptop (with Celeron M 1400) and I want use wasted cpu time better.
Finding Fermat divisors in background is very good thing. Finding "6213186413.2605+1 divides F_600" didn't shake my world (ok maybe little), because in 1985-87 (with Vic20) and 1993-94 (with 486) I found about 60 small divisors. Of course someone has found them already, but that time I didn't know where to get whole list of divisors.
Next thing was verify that new F600 divisor with my own (bit by bit multiply) mod divisor program, with old 486 computer and it found it also. So it's not software or hardware bug, it's really new Fermat divisor!


Maximilian Pacher

was born in Austria (not Australia) in 1971. I have studied mathematics and geometry on the university of Graz and now I am a teacher on a HTL (=higher technical school) in Kapfenberg.
My hobbies are number theory and zoology. I am searching for Fermat-factors since 2001.


Martin Ptáček

I was born in 1985. I live in Cheb in Czech republic.I study University of West Bohemia in Pilzen. I am trying to get master degree in Matematics ingineering, specialization in numerics.I am interested in computers and everything around them, baseball, frisbe, tee. I found out about searching fermat numbers on one lecture, when lecturer mentioned open problems and one of them was the fermat numbers. Few months later I remembered, found this web and started computing. My computer has cpu AMD sempron LE-1200 2,1GHz and 2GB ram.

Matt Anderson

Matt Anderson graduated from Pacific Lutheran University in 1997, with a degree in Math and Engineering. He received a Master's Degree from Oregon State University in 1999, studying electrical engineering. He worked for two years developing circuits for fiber optic devices, and now he works in city hall, as a Legislative Assistant. His webpage is


Cedric Vonck

I am 29 years old. Born in Gent (Ghent) on Halloween 1980 (31/10/80) I studied Applied Informatics and graduated when I was 20 years old. I am working for the Belgian Post Group as a developer (Oracle, Sql Server, Service Center, ...)
I started with distributed projects with Seti@home, RieselSieve, Sob, Fermat Search and countless others)

Jorge Coveiro

I was born June,23 1981 in Beja, Portugal. I'm a Computer Science student at ESTIG-IPBeja. I'm interested in number theory and cryptography. I participate in some research projects since 1998 at my hometown Moura. I use several machines for Fermat Factorization, MersennePrimes search and SETI@home. I have also made some research at Zetagrid, Seventeenorbust, Mersenneathome, OEIS, Folding, SkyNet and KRYPTOS.



Michael Dangler

Born in USA in 1955 Mathematics amateur, my interests are in Prime Numbers, Number Theory and Quantum Theory.
I discovered the 300th Fermat factor.

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