A225097 Numbers n such that (13^n + 12^n)/25 is prime.

3, 11, 13, 43, 67, 109, 15101, 43997

Offset

1,1

Comments

All terms are prime.

a(9) > 10^5.

Links

Table of n, a(n) for n=1..8.

Mathematica

Select[ Prime[ Range[1, 100000] ], PrimeQ[ (13^# + 12^#)/25 ]& ]

Prog

(PARI) is(n)=ispseudoprime((13^n+12^n)/25) \\ Charles R Greathouse IV, May 22 2017

Crossrefs

Cf. A057179, A128071, A128342, A213216, A224984.

Sequence in context: A274343 A113049 A370425 * A079665 A281728 A083992

Adjacent sequences: A225094 A225095 A225096 * A225098 A225099 A225100

Keyword

hard,nonn,more

Author

Robert Price, Apr 27 2013

Status

approved