Joe Buhler Richard E. Crandall Reijo Ernvall Tauno Metsänkylä Mohammad Amin Shokrollahi Irregular Primes and Cyclotomic Invariants to 12 Million. 89-96 2001 31 J. Symb. Comput. 1/2 db/journals/jsc/jsc31.html#BuhlerCEMS01