1,1

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

G. Loeh, Generalized Cullen primes

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

(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

Cf. similar sequences listed in A242176.

Sequence in context: A086881 A212023 A056566 * A187591 A160471 A252709

Adjacent sequences: A242174 A242175 A242176 * A242178 A242179 A242180

nonn,more,bref

Vincenzo Librandi, May 08 2014

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

approved