A242198 Numbers k such that k*15^k + 1 is prime.

8, 14, 44, 154, 274, 694, 17426, 59430

Offset

1,1

Links

Table of n, a(n) for n=1..8.

G. Loeh, Generalized Cullen primes

Mathematica

Select[Range[2000], PrimeQ[# 15^# + 1] &]

Prog

(Magma) [n: n in [0..2500] | IsPrime(n*15^n+1)];
(PARI) is(n)=ispseudoprime(n*15^n+1) \\ Charles R Greathouse IV, Jun 06 2017

Crossrefs

Cf. similar sequences listed in A242176.

Sequence in context: A301961 A250478 A059676 * A111050 A009453 A332658

Adjacent sequences: A242195 A242196 A242197 * A242199 A242200 A242201

Keyword

nonn,more

Author

Vincenzo Librandi, May 08 2014

Extensions

a(7)-a(8) from Loeh's list (see Links)

Status

approved