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%I #64 Aug 02 2024 08:58:03
%S 4,5,7,11,12,14,18,28,30,62,135,153,275,584,630,1424,1493,4419,8492,
%T 10950
%N Numbers k such that k! + (k!/2) + 1 is prime.
%C Numbers k such that A070960(k)+1 is prime.
%C No more terms < 10000. - _Vaclav Kotesovec_, Dec 12 2022
%H <a href="/A358805/b358805.txt">Table of n, a(n) for n = 1..19</a>
%H Arsen Vardanyan, <a href="/A358805/a358805_4.txt">A list of prime numbers</a>
%o (PARI) is(k) = isprime(k!+(k!/2)+1);
%Y Cf. A070960, A358878.
%K nonn,more
%O 1,1
%A _Arsen Vardanyan_, Dec 01 2022
%E a(18)-a(19) from _Vaclav Kotesovec_, Dec 09 2022
%E a(20) from _Michael S. Branicky_, Aug 02 2024