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

5, 1427, 2357, 24499

Offset

1,1

Comments

Terms > 1000 often correspond only to strong pseudoprimes.

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

Links

Table of n, a(n) for n=1..4.

Prog

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

Crossrefs

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

Sequence in context: A096725 A332536 A172920 * A203690 A304425 A316280

Adjacent sequences: A062595 A062596 A062597 * A062599 A062600 A062601

Keyword

nonn,hard

Author

Mike Oakes, May 18 2001, May 19 2001

Extensions

a(4) from Robert Price, Oct 03 2012

Status

approved