Links:
Research groups:
The Number Theory Group at "Universität für Bodenkultur"
http://www.boku.ac.at/math/nth.html
The Barcelona Number Theory Group
http://www-ma2.upc.es/~quer/STNBUPC.html
The Number Theory Group at UCLA
http://www.math.ucla.edu/~ntg/
Number theory sites:
Number Theory web
http://www.numbertheory.org/ntw/web.html
Number Theory ArXiv
http://front.math.ucdavis.edu/math.NT
The prime pages:
http://www.utm.edu/research/primes/
Individuals:
Andrew Granville's homepage
http://www.dms.umontreal.ca/~andrew/
Terence Tao web page
http://www.math.ucla.edu/~tao/
Trevor Wooley web page
http://www.math.lsa.umich.edu/~wooley/
Applets
on line
:
Factorization, etc.:
http://wims.unice.fr/wims/wims.cgi
Primality tests:
http://primes.utm.edu/curios/includes/file.php?file=primetest.html
Applets to compute Riemann zeta function zeros, etc.
http://www.math.ubc.ca/~pugh/
