A272829 Numbers n such that 8^n-7^(n+1) is prime.

27, 43, 61, 105, 835, 2313, 5907, 32455, 33657

Offset: 1

Author

Robert Price, May 07 2016

Keywords

• nonn
• more

Comments

a(10) > 10^5. - Robert Price, May 04 2016

Crossrefs

Cf. A093765, A093713.

Programs

Mathematica

Select[Range[15,100000],PrimeQ[8^# - 7^(# + 1)]]

PARI

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