A225955 Numbers n such that (15^n - 2^n)/13 is prime.

2, 5, 11, 167, 317, 337, 349, 3449, 7517, 23003

Offset

1,1

Comments

All terms are primes.

a(11) > 2*10^5.

Links

Table of n, a(n) for n=1..10.

Mathematica

Select[ Prime[ Range[1, 100000] ], PrimeQ[ (15^# - 2^#)/13 ]& ]

Prog

(PARI) is(n)=ispseudoprime((15^n-2^n)/13) \\ Charles R Greathouse IV, May 22 2017

Crossrefs

Cf. A128028, A016054, A217320, A006033.

Sequence in context: A239900 A123165 A098438 * A236073 A064772 A107989

Adjacent sequences: A225952 A225953 A225954 * A225956 A225957 A225958

Keyword

more,nonn

Author

Robert Price, May 21 2013

Status

approved