A062631 Numbers k such that 65^k - 64^k is prime.

5, 31, 9013, 29077, 35543, 56809, 60167

Offset

1,1

Comments

Terms greater than 1000 are often only strong pseudoprimes.

All terms are prime. - Robert Price, Aug 09 2013

a(8) > 10^5. - Robert Price, Aug 09 2013

Links

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

Prog

(PARI) is(n)=ispseudoprime(65^n-64^n) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

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

Sequence in context: A088548 A244622 A278574 * A156027 A100840 A265159

Adjacent sequences: A062628 A062629 A062630 * A062632 A062633 A062634

Keyword

nonn,hard,more

Author

Mike Oakes, May 18 2001, May 19 2001

Extensions

a(4)-a(7) (calculations by Adam Marciniec) - Robert Price, Aug 09 2013

Status

approved