Here a list of links to mathematicians who are great number theorist, combinatorist, generatingfunctionologist, mathemagician, computer scientist or even novelist.

Jean-Paul Allouche

Cyril Banderier

Arthur Benjamin

Brian Conrey

Jean-Paul Delahaye

Philippe Flajolet (RIP)

Jeffrey Lagarias

Keith Matthew

Tanguy Rivoal

Vladimir Shevelev

NJA Sloane

Gerald Tenenbaum

Herbert Wilf (RIP)

Doron Zeilberger

Wadim Zudilin

OEIS

ISC

The world of Pi

Mathworld

Pari-gp

Wolframalpha

Jeux et mathÃ©matiques

SMF

Europe Echecs