A338525 Numbers k such that (11^k + 6^k)/17 is prime.

5, 7, 107, 383, 17359, 21929, 26393

Offset

1,1

Comments

All terms are prime.

The corresponding primes are 9931, 1162771, ...

Links

Table of n, a(n) for n=1..7.

Wikipedia, Mersenne prime

Mathematica

Select[Range[1, 10000], PrimeQ[(11^# + 6^#)/17] &]

Prog

(PARI) for(n=1, 10000, if(isprime((11^n + 6^n)/17), print1(n, ", ")))
(Magma) [n: n in [1..10000] |IsPrime((11^n + 6^n)/17)]

Crossrefs

Cf. A057177, A125957, A128070, A224501, A128340.

Sequence in context: A292847 A088270 A259496 * A267586 A224507 A065927

Adjacent sequences: A338522 A338523 A338524 * A338526 A338527 A338528

Keyword

nonn,more,hard

Author

Tim Johannes Ohrtmann, Nov 01 2020

Status

approved