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 A062702 #7 Aug 29 2019 09:52:50 %S A062702 3,9,128,675,25306287,3610490805 %N A062702 Index of factorial primes of form m!-1. %F A062702 a(n) = PrimePi(A002982(n)!-1) = A000720(A055490(n)). %e A062702 The exact subscript of 7th prime [=30!-1=265252859812191058636308479999999] is not yet available. %Y A062702 Cf. A002981, A002982, A055490. %K A062702 hard,nonn %O A062702 1,1 %A A062702 _Labos Elemer_, Jul 11 2001 %E A062702 Offset 1 from _Michel Marcus_, Aug 29 2019