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 A076681 #15 Jul 04 2024 01:40:11 %S A076681 2,3,5,10,11,12,17,34,74,136,155,259,271,290,352,479,494,677,776,862, %T A076681 921,932,2211,3927,4688,12567 %N A076681 Numbers k such that 5*k! + 1 is prime. %C A076681 a(26) > 4700. - _Jinyuan Wang_, Feb 04 2020 %e A076681 k = 3 is here because 5*3! + 1 = 31 is prime. %o A076681 (PARI) is(k) = ispseudoprime(5*k!+1); \\ _Jinyuan Wang_, Feb 04 2020 %Y A076681 Cf. A002981, A051915, A076679, A076680, A076682, A076683, A178488, A180626, A126896. %K A076681 nonn,more %O A076681 1,1 %A A076681 Phillip L. Poplin (plpoplin(AT)bellsouth.net), Oct 25 2002 %E A076681 a(25) from _Jinyuan Wang_, Feb 04 2020 %E A076681 a(26) from _Michael S. Branicky_, Jul 03 2024