A062581 Numbers k such that 15^k - 14^k is prime.

2, 3, 43, 173, 193, 7559, 165559

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]

Links

• Henri Lifchitz and Renaud Lifchitz, Top probable primes of the form 15^p-14^p

Crossrefs

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

Programs

PARI

is(n)=ispseudoprime(15^n-14^n) \\ Charles R Greathouse IV, Jun 12 2017

Extensions

a(7) from Jean-Louis Charton, Mar 28 2011