A273598 Numbers k such that (11^k - 6^k)/5 is prime.

2, 3, 11, 163, 191, 269, 1381, 1493, 38453

Offset

1,1

Comments

All terms are prime.

The corresponding primes: 17, 223, 56989774711, ...

Links

Table of n, a(n) for n=1..9.

Mathematica

Select[Range[1, 10000], PrimeQ[(11^# - 6^#)/5] &]

Prog

(PARI) for(n=1, 10000, if(isprime((11^n - 6^n)/5), print1(n, ", ")))

Crossrefs

Cf. A005808, A210506, A128027, A216181, A128347, A273599, A273600, A273601, A062577.

Sequence in context: A042337 A061482 A177854 * A135161 A066100 A029497

Adjacent sequences: A273595 A273596 A273597 * A273599 A273600 A273601

Keyword

nonn,more,hard

Author

Tim Johannes Ohrtmann, May 26 2016

Extensions

a(9) from Michael S. Branicky, Nov 10 2024

Status

approved