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A245241 Integers n such that 6 * 7^n + 1 is prime. 3

%I

%S 0,1,4,9,99,412,2633,5093,5632,28233,36780,47084,53572

%N Integers n such that 6 * 7^n + 1 is prime.

%C All terms correspond to verified primes, that is, not merely probable primes.

%C a(14) > 2*10^5.

%e 4 is in this sequence because 6 * 7^4 + 1 = 14407, which is prime.

%t Select[Range[0,200000], PrimeQ[6 * 7^# + 1] &]

%Y Cf. A003307, A002235, A046865, A079906, A001771, A005541, A056725, A046867, A079907.

%Y Cf. A005537, A005538, A005539, A216889, A216890, A247260.

%K nonn,more

%O 1,3

%A _Robert Price_, Nov 14 2014

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Last modified January 22 07:39 EST 2020. Contains 331139 sequences. (Running on oeis4.)