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

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

Offset

1,1

Comments

Terms > 1000 are often only strong pseudoprimes.

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

Links

Table of n, a(n) for n=1..7.

Prog

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

Crossrefs

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

Sequence in context: A123232 A042559 A197222 * A174259 A215213 A069356

Adjacent sequences: A062642 A062643 A062644 * A062646 A062647 A062648

Keyword

nonn,hard

Author

Mike Oakes, May 18 2001, May 19 2001

Status

approved