A213216 Numbers n such that (12^n + 11^n)/23 is prime.

47, 401, 509, 8609

Offset

1,1

Comments

All terms are prime.

a(5) > 10^5.

Links

Table of n, a(n) for n=1..4.

Mathematica

Select[ Prime[ Range[1, 100000] ], PrimeQ[ (12^# + 11^#)/23 ]& ]

Prog

(PARI) is(n)=ispseudoprime((12^n+11^n)/23) \\ Charles R Greathouse IV, Feb 20 2017

Crossrefs

Cf. A057178, A128341, A181141, A187819, A217095.

Sequence in context: A244770 A255141 A142694 * A324625 A239539 A217119

Adjacent sequences: A213213 A213214 A213215 * A213217 A213218 A213219

Keyword

hard,nonn,more

Author

Robert Price, Mar 02 2013

Extensions

Removed incorrect first term of "2".

Status

approved