|
%I #8 Feb 04 2020 08:51:07
%S 0,1,2,5,8,42,318,326,1054,2987
%N Numbers k such that 6*k! - 1 is prime.
%C Tested to 4400. - _Robert G. Wilson v_, Sep 28 2010
%C a(11) > 6300. - _Jinyuan Wang_, Feb 04 2020
%H <a href="/index/Pri#primepop">Index entries for sequences related to numbers of primes of the form k*n!+-1</a>
%t fQ[n_] := PrimeQ[6 n! - 1]; k = 0; lst = {}; While[k < 1501, If[ fQ@k, AppendTo[lst, k]; Print@k]; k++ ]; lst
%o (PARI) is(k) = ispseudoprime(6*k!-1); \\ _Jinyuan Wang_, Feb 04 2020
%Y Cf. A002982, A076133, A076134, A099350, A099351, A180628, A180630, A180630, A180631.
%K nonn,more
%O 1,3
%A _Robert G. Wilson v_, Sep 13 2010
%E a(10) from _Robert G. Wilson v_, Sep 28 2010
|
