A093794 - OEIS

%I #10 Feb 17 2017 11:57:25

%S 2,14,30,56,96,192,200,462,540,1400,2756,9030,99702

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

%C a(14) > 10^5. - _Robert Price_, Feb 18 2016

%e 14 is a member since 814+712 = 4494935521511 which is a prime number.

%t Do[ If[ PrimeQ[8^n + 7^(n - 1)], Print[n]], {n, 4000}]

%o (PARI) is(n)=isprime(8^n+7^(n-1)) \\ _Charles R Greathouse IV_, Feb 17 2017

%Y Cf. A082103, A093717, A093793, A093765, A096185, A093794, A093795, A096186.

%K nonn

%O 1,1

%A Herman H. Rosenfeld (herm3(AT)pacbell.net), May 18 2004

%E More terms from _Robert G. Wilson v_, Jun 18 2004

%E a(12)-a(13) from _Robert Price_, Feb 18 2016