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A227173
Numbers k such that (138^k + 137^k)/275 is prime.
1
7, 13, 2371, 2791, 2999, 4621, 8819, 21563
OFFSET
1,1
COMMENTS
All terms are prime.
PROG
(PARI) is(n)=ispseudoprime((138^n+137^n)/275) \\ Charles R Greathouse IV, Jun 13 2017
KEYWORD
hard,nonn,more
AUTHOR
Jean-Louis Charton, Jul 03 2013
EXTENSIONS
a(8) from Tyler Busby, Mar 19 2023
STATUS
approved