A242197 Numbers k such that k*14^k + 1 is prime.

3, 5, 6, 9, 33, 45, 243, 252, 1798, 2429, 5686, 12509, 42545

Offset: 1

Author

Vincenzo Librandi, May 08 2014

Keywords

• nonn
• more

Links

• G. Loeh, Generalized Cullen primes

Crossrefs

Cf. similar sequences listed in A242176.

Programs

Magma

[n: n in [0..2000] | IsPrime(n*14^n+1)];

Mathematica

Select[Range[2000], PrimeQ[# 14^# + 1] &]

PARI

is(n)=ispseudoprime(n*14^n+1) \\ Charles R Greathouse IV, Jun 06 2017

Extensions

a(10)-a(13) from Loeh's list (see Links) - Bruno Berselli, May 08 2014