A242177 Numbers k such that k*7^k + 1 is prime.

34, 1980, 9898

Offset

1,1

Links

Table of n, a(n) for n=1..3.

G. Loeh, Generalized Cullen primes

Mathematica

Select[Range[3500], PrimeQ[# 7^# + 1] &]

Prog

(Magma) [n: n in [0..3500] | IsPrime(n*7^n+1)];
(PARI) is(n)=ispseudoprime(n*7^n+1) \\ Charles R Greathouse IV, May 22 2017

Crossrefs

Cf. similar sequences listed in A242176.

Sequence in context: A212023 A056566 A335090 * A187591 A160471 A252709

Adjacent sequences: A242174 A242175 A242176 * A242178 A242179 A242180

Keyword

nonn,more,bref

Author

Vincenzo Librandi, May 08 2014

Extensions

a(3) from Loeh's list (see Links) - Bruno Berselli, May 08 2014

Status

approved