1,1

J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.

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

Eric Weisstein's World of Mathematics, Repunit

H. Lifchitz, Mersenne and Fermat primes field

Sequence in context: A016054 A083842 A123536 this_sequence A059394 A114368 A020467

Adjacent sequences: A057174 A057175 A057176 this_sequence A057178 A057179 A057180

nonn

njas, Sep 15 2000