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A076683 Numbers k such that 7*k! + 1 is prime. 9

%I

%S 3,7,8,15,19,29,36,43,51,158,160,203,432,909,1235,3209

%N Numbers k such that 7*k! + 1 is prime.

%C a(17) > 5830. - _Jinyuan Wang_, Feb 05 2020

%e k = 3 is here because 7*3! + 1 = 43 is prime.

%o (PARI) is(k) = ispseudoprime(7*k!+1); \\ _Jinyuan Wang_, Feb 05 2020

%Y Cf. A002981, A051915, A076679, A076680, A076681, A076682, A178488, A180626, A126896.

%K nonn,more

%O 1,1

%A Phillip L. Poplin (plpoplin(AT)bellsouth.net), Oct 25 2002

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Last modified June 2 10:43 EDT 2020. Contains 334770 sequences. (Running on oeis4.)