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A274135
Numbers n such that 6^n + 5^(n+1) is prime.
0
1, 4, 6, 9, 12, 15, 18, 21, 34, 36, 75, 102, 231, 256, 309, 513, 748, 3789, 12378, 36378
OFFSET
1,2
COMMENTS
a(21) > 10^5.
MATHEMATICA
Select[Range[0, 100000], PrimeQ[6^n + 5^(n + 1)] &]
PROG
(PARI) is(n)=ispseudoprime(6^n + 5^(n+1)) \\ Charles R Greathouse IV, Jun 10 2016
(PFGW) ABC2 6^$a + 5^($a+1)
a: from 1 to 100000
CROSSREFS
Cf. A093765.
Sequence in context: A157124 A162735 A024675 * A163656 A134678 A100915
KEYWORD
nonn,more
AUTHOR
Robert Price, Jun 10 2016
STATUS
approved