A062598 Numbers k such that 32^k - 31^k is prime.

5, 1427, 2357, 24499

Offset: 1

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

• nonn
• hard

Comments

Terms > 1000 often correspond only to strong pseudoprimes.

a(5) > 10^5. - Robert Price, Oct 03 2012

Crossrefs

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

Programs

PARI

is(n)=ispseudoprime(32^n-31^n) \\ Charles R Greathouse IV, Jun 13 2017

Extensions

a(4) from Robert Price, Oct 03 2012