A242201 Numbers n such that n*8^n - 1 is prime.

1, 2, 7, 12, 25, 44, 219, 252, 507, 1155, 2259, 2972, 4584, 12422, 13905, 75606

Offset

1,2

Links

Table of n, a(n) for n=1..16.

Steven Harvey, Generalized Woodall Search

Mathematica

Select[Range[3000], PrimeQ[# 8^# - 1] &]

Prog

(Magma) [n: n in [0..2000] | IsPrime(n*8^n-1)];
(PARI) is(n)=ispseudoprime(n*8^n-1) \\ Charles R Greathouse IV, Jun 06 2017

Crossrefs

Cf. similar sequences listed in A242200.

Sequence in context: A122264 A079824 A059329 * A350093 A177747 A288888

Adjacent sequences: A242198 A242199 A242200 * A242202 A242203 A242204

Keyword

nonn,more

Author

Vincenzo Librandi, May 09 2014

Extensions

a(13)-a(16) from Harvey's list (see Links).

Status

approved