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

2, 5, 61, 97, 167, 433

Offset: 1

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

• nonn
• hard

Comments

Terms > 1000 are often only strong pseudoprimes.

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

Crossrefs

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

Programs

Mathematica

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

PARI

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