A258081 Values of k in A071580.

1, 1, 1, 1, 2, 10, 12, 10, 21, 25, 70, 670, 239, 2115, 586, 1619, 26800, 2505, 99019, 40903, 285641, 67166, 1852765

Offset

1,5

Comments

The first 23 terms were found using gwnum, and the first 22 have been independently checked using gmp.

Links

Table of n, a(n) for n=1..23.

Mersenne Forum, A071580

Prog

(PARI) terms=12; p=2; for(n=2, terms, q=p+1; while(!ispseudoprime(q), q=q+p); print1(q\p, ", "); p=p*q) \\ Serge Batalov, May 19 2015

Crossrefs

Cf. A061092, A072532, A113334.

Sequence in context: A008560 A188283 A174703 * A300907 A327793 A276103

Adjacent sequences: A258078 A258079 A258080 * A258082 A258083 A258084

Keyword

nonn,hard,more

Author

Andrew R. Booker, May 19 2015

Status

approved