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 A062701 #18 Jul 20 2021 07:00:40 %S A062701 1,2,4,2428957 %N A062701 Index of factorial primes of the form k! + 1. %F A062701 a(n) = PrimePi(A002981(n)!+1). %e A062701 The exact subscript of the 5th prime [1 + 27! = 10888869450418352160768000001] is not yet available. %Y A062701 Cf. A000720, A002981, A002982, A055490, A088332. %K A062701 hard,nonn,more %O A062701 1,2 %A A062701 _Labos Elemer_, Jul 11 2001 %E A062701 Offset 1 from _Michel Marcus_, Aug 29 2019