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 A139442 #17 Jan 13 2017 19:57:06
%S A139442 3,4,7,9,10,11,13,15,22,23,29,45,51,52,55,69,98,122,157,268,367,476,
%T A139442 481,1670,1964,2736,4696,7933,22245
%N A139442 Numbers n such that primorial(n)/2 - 8 is prime.
%C A139442 a(30) > 25000. - _Robert Price_, Jan 13 2017
%t A139442 k = 1; a = {}; Do[k = k*Prime[n]; If[PrimeQ[k - 8] && k > 8, Print[n]; AppendTo[a, n]], {n, 2, 481}]; a
%o A139442 (PARI) is(n)=ispseudoprime(prod(i=2,n,prime(i))-8) \\ _Charles R Greathouse IV_, Jun 13 2013
%Y A139442 Cf. A067026, A067027, A139439-A139457, A103514.
%K A139442 nonn
%O A139442 1,1
%A A139442 _Artur Jasinski_, Apr 21 2008
%E A139442 a(24)-a(25) from _Charles R Greathouse IV_, Jun 13 2013
%E A139442 a(26)-a(27) from _Ray Chandler_, Jun 16 2013
%E A139442 a(28)-a(29) from _Robert Price_, Jan 13 2017