| Chris K. Caldwell / Reginald McLean |
The Prime Pages Top 20 Prime Page The Nth Prime Page Smallest Titanics of Special Forms |
| Marcel Martin | PRIMO - "Elliptic Curve Primality Proving" software |
| Andreas Enge | CM - "Elliptic Curve Primality Proving" software |
| Jens Kruse Andersen | Prime Records |
| N. J. A. Sloane | OEIS - The On-Line Encyclopedia of Integer Sequences |
| Thomas J. Engelsma | Permissible patterns of prime k-tuplets |
| Robin Whitty | Theorem of the Day |
| Dr. Minh. L. Perez Press | Smarandache Primes |
| Henri Lifchitz & Renaud Lifchitz | PRP -records |
| Patrick De Geest | World!Of Numbers |
| Riecoin | Constellation Explorer |
| Steffen Polster (page in german) | Mathematik alpha |
| Makoto Kamada | Factorization of Repunits |
| Markus Tervooren | Data Base of Factors (factordb.com) |
| Matthew C. Anderson, hosted by Norman Luhn | Prime Constellations Page Blog of Matthew C. Anderson on mersenneforum.org |
| Julius Schön | (Prime Tuplet 6,5,4,3,Cousin Database) |
| Hans-Michael Elvenich (page in german) | www.Primzahlen.de |
| GIMPS | Great Internet Mersenne Prime Search |
| Dario Alpern | Integer factorization calculator |
| Prime Gaps | Prime Gaps records |
| Henri Lifchitz | BiTwin records |
| Dr. Thomas R. Nicely (1943-2019) | Research in Computational Number Theory |