1,1

Chai Wah Wu, Table of n, a(n) for n = 1..1201

a(n) = A020639(A135972(n)).

(PARI) for(n=2, 1e2, if(!ispseudoprime(2^n-1), p=factor(2^n-1)[1, 1]; print1(p, ", ")))

Cf. A135972, A242017. Subsequence of A056608.

Sequence in context: A291767 A135087 A294505 * A084038 A326930 A095108

Adjacent sequences: A242013 A242014 A242015 * A242017 A242018 A242019

nonn

Felix FrÃ¶hlich, Aug 11 2014

approved