%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
