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A225807 Numbers n such that (17^n - 2^n)/15 is prime. 2
2, 83, 1907, 2591, 16223, 17183 (list; graph; refs; listen; history; text; internal format)
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

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Last modified February 28 05:34 EST 2020. Contains 332321 sequences. (Running on oeis4.)