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%I #7 May 22 2017 20:00:49
%S 4,5,6,7,9,12,73,129,142,144,253,455,531,734,1009,1193,1553,2449,3309,
%T 13534,17513,17832,22852
%N Numbers n such that primorial(n)/2 + 512 is prime.
%C a(24) > 25000. - _Robert Price_, May 22 2017
%t k = 1/2; a = {}; Do[k = k*Prime[n]; If[PrimeQ[k + 512], Print[n]; AppendTo[a, n]], {n, 325}]; a
%Y Cf. A067026, A067027, A139439-A139457, A103514.
%K nonn
%O 1,1
%A _Artur Jasinski_, Apr 21 2008
%E a(12)-a(18) from _Ray Chandler_, Jun 16 2013
%E a(19)-a(23) from _Robert Price_, May 22 2017
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