A062642 Numbers k such that 76^k - 75^k is prime.

2, 5, 61, 97, 167, 433

Offset

1,1

Comments

Terms > 1000 are often only strong pseudoprimes.

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

Links

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

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

Cf. A000043, A057468, A059801, A059802, A062572-A062666.

Sequence in context: A138788 A030244 A004150 * A294528 A363335 A358087

Adjacent sequences: A062639 A062640 A062641 * A062643 A062644 A062645

Keyword

nonn,hard

Author

Mike Oakes, May 18 2001, May 19 2001

Status

approved