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 A178488 #13 Jul 03 2024 19:01:32
%S A178488 2,4,9,10,11,12,15,25,31,46,53,78,318,615,955,1646,2669,2672,3515,7689
%N A178488 Numbers k such that 8*k! + 1 is prime.
%C A178488 a(20) > 3810. - _Jinyuan Wang_, Feb 05 2020
%C A178488 a(21) > 12000. - _Michael S. Branicky_, Jul 03 2024
%H A178488 <a href="/index/Pri#primepop">Index entries for sequences related to numbers of primes of the form k*n!+-1</a>
%t A178488 fQ[n_] := PrimeQ[8 n! + 1]; k = 0; lst = {}; While[k < 1501, If[ fQ@k, AppendTo[lst, k]; Print@k]; k++ ]; lst
%o A178488 (PARI) for(k=1, 999, ispseudoprime(8*k!+1) & print1(k, ", "))
%o A178488 (PFGW) ABC2 8*$a!+1
%o A178488 a: from 1 to 1000 // _Jinyuan Wang_, Feb 05 2020
%Y A178488 Cf. A002981, A051915, A076679, A076680, A076681, A076682, A076683, A180626, A126896.
%K A178488 nonn,hard,more
%O A178488 1,1
%A A178488 _Robert G. Wilson v_, Sep 13 2010 and _M. F. Hasler_, Sep 16 2010
%E A178488 a(16)-a(19) from _Jinyuan Wang_, Feb 05 2020
%E A178488 a(20) from _Michael S. Branicky_, Jul 02 2024