A225191 Numbers n such that (15^n + 2^n)/17 is prime.

3, 67, 199, 479, 563, 2243, 2579, 6599, 7951, 10099, 10909, 13759

Offset

1,1

Comments

All terms are odd primes.

a(13) > 10^5.

Links

Table of n, a(n) for n=1..12.

Mathematica

Select[Prime[Range[1, 100000]], PrimeQ[(15^# + 2^#)/17]&]

Prog

(PARI) forprime(p=3, 10^6, if(ispseudoprime((15^p + 2^p)/17), print1(p, ", ") ) ); \\ Joerg Arndt, Jul 29 2013

Crossrefs

Cf. A057181, A125956, A125957, A222265.

Sequence in context: A142926 A041983 A263549 * A370659 A201857 A294395

Adjacent sequences: A225188 A225189 A225190 * A225192 A225193 A225194

Keyword

nonn,hard,more

Author

Robert Price, May 07 2013

Extensions

Removed incorrect first term of "2".

Status

approved