Dubner Cruncher


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): C, CD, D, DB, DK, WD
E-mail address: (e-mail address unpublished)
Username Cruncher (entry created on 12/17/2003 23:12:22 CDT)
Database id:579 (entry last modified on 4/23/2010 15:45:01 CDT)
Program Does *: other, prp, plus, minus, classical
Active primes:on current list: 27, rank by number 21
Total primes: number ever on any list: 4637
Production score: for current list 34 (normalized: 0), total 43.9432, rank by score 30
Largest prime: 10205030 + 7047407 · 10102512 + 1 ‏(‎205031 digits) via code D on 11/27/2011 11:04:57 CDT
Most recent: 10205030 + 7047407 · 10102512 + 1 ‏(‎205031 digits) via code D on 11/27/2011 11:04:57 CDT
Entrance Rank: mean 1782.63 (minimum 7, maximum 9708)

Descriptive Data: (report abuse)

In 1996 D. J. Bernstein wrote "The Dubner Cruncher is a card that can multiply and divide large integers at supercomputer speed." As machines have sped up this is no longer true, but at the time the cards were quite amazing! Based on real time digital signal processing chips with homegrown software, these cards turned a desk-top PC into quite a calculating machine. They were build amd sold by Harvey Dubner and his son. See [Caldwell1993] for more information.

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