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A225818
Numbers n such that (19^n + 18^n)/37 is prime.
3
5, 223, 311, 54547
OFFSET
1,1
COMMENTS
All terms are primes.
a(5) > 10^5. - Robert Price, Oct 03 2013
MATHEMATICA
Select[ Prime[ Range[1, 100000] ], PrimeQ[ (19^# + 18^#)/37 ]& ]
PROG
(PARI) is(n)=ispseudoprime((19^n+18^n)/37) \\ Charles R Greathouse IV, Jun 06 2017
CROSSREFS
KEYWORD
hard,nonn,more
AUTHOR
Robert Price, Aug 26 2013
STATUS
approved