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

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

Offset: 1

Author

Robert Price, Jun 13 2016

Keywords

• nonn
• more

Comments

a(9) > 10^5.

Crossrefs

Cf. A093765.

Programs

Mathematica

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

PARI

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