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 A385949 #17 Jul 26 2025 16:09:24 %S A385949 1,1,2,6,21,102,609,4260,34075,306670,3066692,33733610,404803314, %T A385949 5262443074,73674203025,1105113045374,17681808725979,300590748341642, %U A385949 5410633470149548,102802035932841396,2056040718656827910,43176855091793386107,949890812019454494354 %N A385949 Number of digits in 7^(n!). %F A385949 a(n) = A055642(A220079(n)). %t A385949 Array[ Floor[#! Log10@7 + 1] &, 22] %Y A385949 Cf. A055642, A220079, A317873. %K A385949 nonn,base %O A385949 0,3 %A A385949 _Vincenzo Librandi_, Jul 24 2025