Reto Keiser


A titan, as defined by Samuel Yates, is anyone who has found a titanic prime. This page provides data on those that have found these primes. The data below only reflects on the primes currently on the list. (Many of the terms that are used here are explained on another page.)

Proof-code(s): g220, c26, L126, L165, L194, L471, p371, p391
E-mail address:
Username Keiser (entry created on 1/20/2001 16:09:43 CDT)
Database id:296 (entry last modified on 2/17/2016 16:52:32 CDT)
Active primes:on current list: 2 (unweighted total: 2), rank by number 379
Total primes: number ever on any list: 90.5 (unweighted total: 94)
Production score: for current list 46 (normalized: 8), total 46.8334, rank by score 533
Largest prime: 5553507 · 23322000 + 1 ‏(‎1000029 digits) via code p391 on 2/17/2016 16:54:29 CDT
Most recent: 5553507 · 23322000 + 1 ‏(‎1000029 digits) via code p391 on 2/17/2016 16:54:29 CDT
Entrance Rank: mean 129.50 (minimum 107, maximum 152)

Descriptive Data: (report abuse)

Birth Date: 20 July 1976
First interest in prime numbers in 1982; but had access to a computer 10 years later.
Education: 2003 Graduated Electrical Engineering at Swiss Federal Institute of Technology ETH in Zurich
Occupation: Technical consultant and Programmer

Discovery of a new factor of MM31
Discovery of the largest Prime Triplet (for some time)
51 digit GMP ECM factor of 2^984+1 in 2004
Some factors of general Fermat numbers
Fermat divisor 243*2^495732+1 (149233 digits) Divides Fermat F(495728), GF(495726,3), GF(495728,6), GF(495727,12)

Surname: Keiser (used for alphabetizing and in codes).
Unverified primes are omitted from counts and lists until verification completed.
I am Reto Keiser and I would like to
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