Marcel Martin's Primo (was Titanix and Certifix)
(Another of the Prime Pages' resources)
The Largest Known Primes Icon
  View this page in:   language help
GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

program 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 reflect on the primes currently on the list. (Many of the terms that are used here are explained on another page.)

Proof-code(s): F2, x1, x25, p40, p87 ... ... p298, x14, CH10, CH11, x45
Active wild codes: ^c\d+
Code prefix:c
E-mail address:
Web page:
Username: Primo (entry created on 08/25/2000)
Database id:46 (entry last modified on 11/08/2018)
Program Does *: general
Active primes:on current list: 387, rank by number 8
Total primes: number ever on any list: 1804
Production score: for current list 41 (normalized: 0), total 45.6400, rank by score 27
Largest prime: Phi(5, (1121302646 · 16001#/5 + 1) · (28633 · 16001# - 1)9) ‏(‎276344 digits) via code x38 on 08/12/2014
Most recent: 121152729080 · 7019#/1729 + 7 ‏(‎3025 digits) via code c92 on 10/14/2019
Entrance Rank: mean 60144.06 (minimum 10499, maximum 110142)

Descriptive Data: (report abuse)
Primo is a program that will test numbers that are not of any special form. This is far more difficult (and slower) than doing so for primes n with special forms (e.g., those where n+1 factors nicely).

Primo is a primality proving program based on the ECPP algorithm: Elliptic Curve Primality Proving. Given positive odd integers, Primo tests whether these integers are prime, and if they are it produces primality certificates. Primo is suitable for the checking of crypto-primes and to prove whether they are actually prime... or not.

I administer Marcel Martin's Primo (was Titanix and Certifix) and I would like to
Edit this page
Surname: Primo (used for alphabetizing and in codes)
Unverified primes are omitted from counts and lists until verification completed.