

A222265


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


2




OFFSET

1,1


COMMENTS

All terms are prime.
a(10) > 10^5.


LINKS

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


MATHEMATICA

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


PROG

(PARI) forprime(p=3, 10^6, if(ispseudoprime((13^p + 2^p)/15), print1(p, ", ") ) ); \\ Joerg Arndt, Jul 29 2013


CROSSREFS

Cf. A125956, A125957, A057159, A128071, A213176.
Sequence in context: A055899 A218956 A139876 * A107392 A054497 A235593
Adjacent sequences: A222262 A222263 A222264 * A222266 A222267 A222268


KEYWORD

nonn,hard,more


AUTHOR

Robert Price, May 05 2013


EXTENSIONS

Removed incorrect first term of "2".


STATUS

approved



