Harvey Dubner


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): D, CD, DB, DK, WD, gd, c12, c19, x30, p138, x39, c70, c74
E-mail address: harvey@dubner.com
Username Dubner (entry created on 1/18/2000 18:50:53 UTC)
Database id:5 (entry last modified on 5/1/2020 22:16:26 UTC)
Active primes:on current list: 19.3333 (unweighted total: 29), rank by number 40
Total primes: number ever on any list: 4524.33 (unweighted total: 4587)
Production score: for current list 36 (normalized: 0), total 43.9527, rank by score 1027
Largest prime: 10205030 + 7047407 · 10102512 + 1 ‏(‎205031 digits) via code D on 11/27/2011 17:04:57 UTC
Most recent: R(49081) ‏(‎49081 digits) via code c70 on 3/21/2022 12:15:00 UTC
Entrance Rank: mean 21230.03 (minimum 7, maximum 66771)

Descriptive Data: (report abuse)

Harvey Dubner is an electrical engineer and an amateur number theorist.  He found all of his early primes using the Dubner Crunchers that he and his son designed and sold.  In the early days of PC's, these coprocessors (which fit in IBM compatibles) were used to find an impressive number of record primes.

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