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

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

Offset: 1

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

• nonn
• hard

Comments

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

Crossrefs

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

Programs

PARI

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

Extensions

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