A062646 Numbers k such that 80^k - 79^k is prime.

7, 277, 6133

Offset

1,1

Comments

Terms > 1000 are often only strong pseudoprimes.

a(4) > 10^5. - Robert Price, Dec 12 2014

Links

Table of n, a(n) for n=1..3.

Prog

(PARI) is(n)=ispseudoprime(80^n-79^n) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

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

Sequence in context: A222942 A289634 A065581 * A009503 A209889 A176072

Adjacent sequences: A062643 A062644 A062645 * A062647 A062648 A062649

Keyword

nonn,hard,bref

Author

Mike Oakes, May 18 2001, May 19 2001

Status

approved