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

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

Offset: 1

Author

Tim Johannes Ohrtmann, Nov 01 2020

Keywords

• nonn
• more
• hard

Comments

All terms are prime.

The corresponding primes are 9931, 1162771, ...

Links

• Wikipedia, Mersenne prime

Crossrefs

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

Programs

Magma

[n: n in [1..10000] |IsPrime((11^n + 6^n)/17)]

Mathematica

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

PARI

for(n=1, 10000, if(isprime((11^n + 6^n)/17), print1(n, ", ")))