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

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

Offset: 1

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

• nonn
• hard
• more

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

Crossrefs

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

Programs

PARI

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

Extensions

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