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A236371 Numbers n such that 7^n - 12 is prime. 9

%I

%S 2,3,4,12,27,28,34,36,147,179,242,276,278,466,735,2371,4548,5606,

%T 10324,82899

%N Numbers n such that 7^n - 12 is prime.

%C a(21) > 10^5.

%t Select[Range[1, 100000], PrimeQ[7^# - 12] &]

%o (PARI) for(n=1, 5*10^5, if(isprime(7^n-12), print1(n, ", ")))

%Y Cf. A236371, A217131, A191469, A090669, A096305, A217130, A217132, A152213.

%K nonn

%O 1,1

%A _Robert Price_, Jan 23 2014

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Last modified August 15 00:52 EDT 2020. Contains 336484 sequences. (Running on oeis4.)