Geoffrey Reynolds' gcwsieve
(Another of the Prime Pages' resources)
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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):
L436, L447, L521, p234, p237 ... ... L3269, p357, L3532, L3544, L4472
E-mail address:
g_w_reynolds(at)yahoo(dot)co(dot)nz
Web page:http://sites.google.com/site/geoffreywalterreynolds/programs/
Username: gcwsieve (entry created on 08/08/2007)
Database id:1223 (entry last modified on 10/09/2016)
Program Does *: sieve
Active primes:on current list: 41, rank by number 15
Total primes: number ever on any list: 97
Production score: for current list 50 (normalized: 540), total 50.0404, rank by score 20
Largest prime: 6679881 · 26679881 + 1 ‏(‎2010852 digits) via code L917 on 08/04/2009
Most recent: 91179 · 21823580 - 1 ‏(‎548958 digits) via code L2777 on 12/18/2016
Entrance Rank: mean 549.32 (minimum 13, maximum 4839)

Descriptive Data: (report abuse)
A sieve for generalised Cullen/Woodall numbers n*b^n+/-1, where n < 2^32, b < 2^32. This sieve requires an existing ABC file (as produced by MultiSieve) with all factors smaller than the greatest exponent n already removed. The algorithm is based on an idea of Harsh Aggarwal, implemented with the help of Mark Rodenkirch.

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