|Personal data :|
|Real name :||Paul Leyland|
|Wikipedia entry :||Paul_Leyland|
He has contributed to the factorization of RSA-129, RSA-140 and RSA-155, as well as potential factorial primes as large as 400! + 1. He has also studied Cunningham numbers, Cullen numbers, Woodall numbers, etc., and numbers of the form [math]x^y + y^x[/math], which are now called Leyland numbers.