A062642 - OEIS

A062642

Numbers k such that 76^k - 75^k is prime.

2, 5, 61, 97, 167, 433

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OFFSET

1,1

COMMENTS

Terms > 1000 are often only strong pseudoprimes.

a(7) > 10^5. - Robert Price, Jul 24 2014

LINKS

MATHEMATICA

Select[Range[450], PrimeQ[76^#-75^#]&] (* Harvey P. Dale, Aug 30 2013 *)

PROG

(PARI) is(n)=ispseudoprime(76^n-75^n) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

KEYWORD

nonn,hard

AUTHOR

Mike Oakes, May 18 2001, May 19 2001

STATUS

approved