1,1

(20^1163+1)/21, a 1512-digit number, has been certified prime with Primo. - Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 17 2002

H. Dubner and T. Granlund, Primes of the Form (b^n+1)/(b+1), J. Integer Sequences, 3 (2000), #P00.2.7.

Sequence in context: A015056 A015973 A136578 this_sequence A106939 A142114 A141828

Adjacent sequences: A057183 A057184 A057185 this_sequence A057187 A057188 A057189

nonn

N. J. A. Sloane (njas(AT)research.att.com), Sep 15 2000