A242199 Numbers k such that k*16^k + 1 is prime.

1, 3, 55, 81, 223, 1227, 3012, 3301

Offset

1,2

Links

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

G. Loeh, Generalized Cullen primes

Mathematica

Select[Range[2000], PrimeQ[# 16^# + 1] &]

Prog

(Magma) [n: n in [0..2000] | IsPrime(n*16^n+1)];
(Sage) [n for n in (1..2000) if is_prime(n*16^n + 1)] # Bruno Berselli, May 09 2014
(PARI) is(n)=ispseudoprime(n*16^n+1) \\ Charles R Greathouse IV, Jun 06 2017

Crossrefs

Cf. similar sequences listed in A242176.

Sequence in context: A319038 A340214 A088278 * A268661 A041155 A111483

Adjacent sequences: A242196 A242197 A242198 * A242200 A242201 A242202

Keyword

nonn,more

Author

Vincenzo Librandi, May 08 2014

Extensions

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

Status

approved