Apfloat Home Page
Science, Math, Number Theory, Software - apfloat. High-performance arbitrary precision arithmetic package for C++ and Java.
http://www.apfloat.org/
Ray Ballinger's Proth Search Page
Science, Math, Number Theory, Prime Numbers - Yves Gallot's Proth Search Page. A list of prime number searches using Yves Gallot's proth.
https://www.prothsearch.net/
mersenneforum.org - Powered by vBulletin
Science, Math, Number Theory, Prime Numbers - mersenneforum.org. A forum about prime numbers and computerized searches for more of them.
https://www.mersenneforum.org/
Ars Technica Team Prime Rib
Science, Math, Number Theory, Prime Numbers - Ars Technica Team Prime Rib. A distributed computing team dedicated to finding Mersenne prime numbers.
http://www.teamprimerib.com/
NumberSpiral.com - Home
Science, Math, Number Theory, Prime Numbers - Number Spiral. Explains this method of visually representing the distribution of primes and the relationships between factors and products.
https://numberspiral.com/
Roland Queme Home Page
Science, Math, Number Theory, People - Queme, Roland. Algebraic number theory.
http://roland.queme.free.fr/
Thomas R. Nicely's Home Page
Science, Math, Number Theory, People - Nicely, Thomas R.. Computations on primes, prime gaps, prime constellations (twins, triplets, and quadruplets) and their reciprocal sums (to extrapolate estimates for the corresponding Brun's constants).
https://www.trnicely.net/
The Factor Zone
Science, Math, Number Theory, Factoring - The Factor Zone. Aimed at grade school students and teachers, includes course guidelines, worksheets, and factor tables up to 600.
https://factorzone.tripod.com/
New York Seminar and Workshops
Science, Math, Number Theory, Events - New York Seminar and Workshops. Schedules of the regular seminar and annual workshops.
http://www.theoryofnumbers.com/