Masakatu Morii


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.)

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Proof-code(s): MM, gm, g339
E-mail address:
Web page:
Username Morii (entry created on 1/18/2000 12:50:53 CDT)
Database id:47 (entry last modified on 7/28/2014 08:39:21 CDT)
Active primes:on current list: 3 (unweighted total: 3), rank by number 283
Total primes: number ever on any list: 5 (unweighted total: 5)
Production score: for current list 40 (normalized: 0), total 40.7998, rank by score 1013
Largest prime: 481899 · 2481899 + 1 ‏(‎145072 digits) via code gm on 9/30/1998 07:55:34 CDT
Most recent: 19830119 · 2168199 + 1 ‏(‎50641 digits) via code g339 on 2/18/2004 01:38:43 CDT
Entrance Rank: mean 160.00 (minimum 7, maximum 238)

Descriptive Data: (report abuse)

Dr. Masakatu Morii has been a Professor at the Department of Electrical and Electronics Engineering, Kobe University, Kobe, Japan. His research interests are in error correcting codes, cryptography, discrete mathematics and computer networks. He has found the second largest Cullen prime in 1998; 481899*2^{481899}+1.

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