Jens Kruse Andersen:
Largest Known Simultaneous Primes
The Largest Known Primes in CPAP's
Primes in Arithmetic Progression
Largest Consecutive Factorizations

Jens Kruse Andersen (duplication page for updates by Norman Luhn)
prime records - main page

Dirk Augustin, hosted by Jens Kruse Andersen:
Cunningham Chain records

N.J. A. Sloane:
The On-Line Encyclopedia of Integer Sequences

Thomas J Engelsma :
Permissible Patterns

Robin Whitty:
Theorem of the Day

Dr. Minh. L. Perez Press:
SMARANDACHE PRIMES

Henri Lifchitz & Renaud Lifchitz:
Largest Known PRPs

Patrick De Geest:
World!Of Numbers

Riecoin:
Constellation Explorer

Steffen Polster: (german):
Mathematik alpha

Makoto Kamada:
Factorization of 11...11 (Repunit)

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
Click

Julius Schön , hosted by Norman Luhn:
(Prime Tuplet 6,5,4,3,Cousin Database)