A215535 Numbers k such that 36^k - 35^k is prime.

2, 5, 7, 23, 45737

Offset

1,1

Comments

The number k has to be a prime.

a(6) > 10^5. - Robert Price, Oct 08 2012

Links

Table of n, a(n) for n=1..5.

Mathematica

Select[Prime[Range[PrimePi[1000]]], PrimeQ[36^# - 35^#] &] (* T. D. Noe, Aug 15 2012 *)

Prog

(PARI) is(n)=ispseudoprime(36^n-35^n) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A182474 A106018 A188499 * A056921 A041245 A042159

Adjacent sequences: A215532 A215533 A215534 * A215536 A215537 A215538

Keyword

nonn,hard

Author

Jean-Louis Charton, Aug 15 2012

Extensions

a(5) from Robert Price, Oct 08 2012

Status

approved