Jean Penné

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):	L2, L97, L103, L159, L591
E-mail address:	jpenne@free.fr
Username	Penne	(entry created on 12/29/2002 12:58:22 UTC)
Database id:	437	(entry last modified on 1/23/2026 03:52:36 UTC)
Active primes:	on current list: 1 (unweighted total: 1), rank by number 523
Total primes:	number ever on any list: 25.2 (unweighted total: 26)
Production score:	for current list 46 (normalized: 2), total 47.4722, rank by score 658
Largest prime:	23451 · 2^3739388 + 1 ‏(‎1125673 digits) via code L591 on 8/3/2015 07:04:56 UTC
Most recent:	23451 · 2^3739388 + 1 ‏(‎1125673 digits) via code L591 on 8/3/2015 07:04:56 UTC
Entrance Rank:	mean 90.00 (minimum 90, maximum 90)

Descriptive Data: (report abuse)

I was born in 1935, and I am a retired Research Engineer from C.N.R.S. My main hobbies are Number theory, Mathematics of computation, and indeed, big primes hunting ! I am computing for GIMPS since October 1996, and made efforts to build programs able to prove the primality of other special form numbers. This succeeded recently to make the LLR program available.

Surname: Penne (used for alphabetizing and in codes).
Unverified primes are omitted from counts and lists until verification completed.

I am Jean Penné and I would like to

(Reuse an old code if your are using the same programs, projects... Only create a new code if you are doing something differently than in the past. Duplicate codes will be merged.