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A062581
Numbers k such that 15^k - 14^k is prime.
1
2, 3, 43, 173, 193, 7559, 165559
OFFSET
1,1
COMMENTS
Terms greater than 1000 may correspond to (unproven) strong pseudoprimes. [Clarified by M. F. Hasler, Sep 16 2013]
PROG
(PARI) is(n)=ispseudoprime(15^n-14^n) \\ Charles R Greathouse IV, Jun 12 2017
KEYWORD
nonn,hard
AUTHOR
Mike Oakes, May 18 2001, May 19 2001
EXTENSIONS
a(7) from Jean-Louis Charton, Mar 28 2011
STATUS
approved