A062645 Numbers k such that 79^k - 78^k is prime.

2, 5, 7, 41, 79, 2957, 9949

Offset: 1

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

• nonn
• hard

Comments

Terms > 1000 are often only strong pseudoprimes.

a(8) > 10^5. - Robert Price, Nov 10 2014

Crossrefs

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

Programs

PARI

is(n)=ispseudoprime(79^n-78^n) \\ Charles R Greathouse IV, Jun 13 2017