A272829 - OEIS

%I #6 Jun 13 2017 14:42:10

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

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

%C a(10) > 10^5. - _Robert Price_, May 04 2016

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

%o (PARI) is(n)=ispseudoprime(8^n-7^(n+1)) \\ _Charles R Greathouse IV_, Jun 13 2017

%Y Cf. A093765, A093713.

%K nonn,more

%O 1,1

%A _Robert Price_, May 07 2016