A225807 Numbers n such that (17^n - 2^n)/15 is prime.

2, 83, 1907, 2591, 16223, 17183

Offset

1,1

Comments

All terms are primes.

a(7) > 10^5.

Links

Table of n, a(n) for n=1..6.

Mathematica

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

Prog

(PARI) is(n)=ispseudoprime((17^n-2^n)/15) \\ Charles R Greathouse IV, Jun 06 2017

Crossrefs

Cf. A128031, A225955, A217320, A006034.

Sequence in context: A037069 A065591 A266201 * A232770 A317724 A099373

Adjacent sequences: A225804 A225805 A225806 * A225808 A225809 A225810

Keyword

more,nonn

Author

Robert Price, Jul 29 2013

Status

approved