A274215 Numbers n such that 8^n + 7^(n+1) is prime.

4, 6, 46, 58, 184, 336, 29274, 98928

Offset

1,1

Comments

a(9) > 10^5.

Links

Table of n, a(n) for n=1..8.

Mathematica

Select[Range[0, 100000], PrimeQ[8^# + 7^(# + 1)] &]

Prog

(PARI) is(n)=ispseudoprime(8^n+7^(n+1)) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A093765.

Sequence in context: A012935 A013166 A174653 * A119944 A338814 A134592

Adjacent sequences: A274212 A274213 A274214 * A274216 A274217 A274218

Keyword

nonn,more

Author

Robert Price, Jun 13 2016

Status

approved