A242178 Numbers k such that k*8^k + 1 is prime.

5, 17, 23, 1911, 20855, 35945, 42816

Offset

1,1

Links

Table of n, a(n) for n=1..7.

G. Loeh, Generalized Cullen primes

Mathematica

Select[Range[2000], 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, May 22 2017

Crossrefs

Cf. similar sequences listed in A242176.

Sequence in context: A097434 A106012 A230527 * A343594 A063588 A307286

Adjacent sequences: A242175 A242176 A242177 * A242179 A242180 A242181

Keyword

nonn,more

Author

Vincenzo Librandi, May 08 2014

Extensions

a(5)-a(7) from Loeh's list (see Links) - Bruno Berselli, May 08 2014

Status

approved