A225818 Numbers n such that (19^n + 18^n)/37 is prime.

5, 223, 311, 54547

Offset

1,1

Comments

All terms are primes.

a(5) > 10^5. - Robert Price, Oct 03 2013

Links

Table of n, a(n) for n=1..4.

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

Cf. A227170, A221637, A228558, A227046.

Sequence in context: A195633 A112999 A337965 * A185551 A324098 A263430

Adjacent sequences: A225815 A225816 A225817 * A225819 A225820 A225821

Keyword

hard,nonn,more

Author

Robert Price, Aug 26 2013

Status

approved