This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A139443 #7 Dec 08 2016 10:05:46
%S A139443 1,2,3,5,6,8,13,25,26,30,34,63,75,138,149,672,752,1067,1256,1370,3357,
%T A139443 4120,6672,7201,7469,8738,9426,11608
%N A139443 Numbers n such that primorial(n)/2 + 16 is prime.
%C A139443 a(29) > 25000. - _Robert Price_, Dec 08 2016
%t A139443 k = 1/2; a = {}; Do[k = k*Prime[n]; If[PrimeQ[k + 16], Print[n]; AppendTo[a, n]], {n, 752}]; a
%Y A139443 Cf. A067026, A067027, A139439-A139457, A103514.
%K A139443 nonn
%O A139443 1,2
%A A139443 _Artur Jasinski_, Apr 21 2008
%E A139443 a(1)=1 inserted and program corrected, a(18)-a(20) from _Ray Chandler_, Jun 16 2013
%E A139443 a(21)-a(28) from _Robert Price_, Dec 08 2016