A062579 Numbers k such that 13^k - 12^k is prime.

17, 31, 41, 47, 109, 163, 643, 2459, 9743, 30271, 87557

Offset

1,1

Comments

Terms greater than 1000 may correspond to (unproven) strong pseudoprimes. [Clarified by M. F. Hasler, Sep 16 2013]

Links

Table of n, a(n) for n=1..11.

Prog

(PARI) is(n)=ispseudoprime(13^n-12^n) \\ Charles R Greathouse IV, Jun 12 2017

Crossrefs

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

Sequence in context: A235920 A268923 A172287 * A134076 A258029 A321596

Adjacent sequences: A062576 A062577 A062578 * A062580 A062581 A062582

Keyword

nonn,hard

Author

Mike Oakes, May 18 2001, May 19 2001

Extensions

Two more terms 30271 and 87557 (found in 2007 and 2008) from Jean-Louis Charton, Sep 02 2009

Status

approved