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A215536 Numbers n such that 87^n - 86^n is prime. 2
2, 3, 47, 44563 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(5) > 10^5. - Robert Price, May 11 2015

LINKS

Table of n, a(n) for n=1..4.

MATHEMATICA

Select[Prime[Range[PrimePi[1000]]], PrimeQ[87^# - 86^#] &] (* T. D. Noe, Aug 15 2012 *)

PROG

(PARI) is(n)=ispseudoprime(87^n-86^n) \\ Charles R Greathouse IV, Jun 06 2017

CROSSREFS

Sequence in context: A266512 A041501 A163488 * A173355 A118222 A191594

Adjacent sequences:  A215533 A215534 A215535 * A215537 A215538 A215539

KEYWORD

nonn,hard

AUTHOR

Jean-Louis Charton, Aug 15 2012

EXTENSIONS

a(4) from Robert Price (computer run by Adam Marciniec), May 11 2015

STATUS

approved

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Last modified July 18 07:10 EDT 2019. Contains 325134 sequences. (Running on oeis4.)