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 A385951 #9 Jul 31 2025 22:46:31 %S A385951 1,1,2,5,17,84,504,3523,28183,253643,2536423,27900646,334807751, %T A385951 4352500756,60935010579,914025158672,14624402538737,248614843158529, %U A385951 4475067176853513,85026276360216746,1700525527204334919,35711036071291033288,785642793568402732327 %N A385951 Number of digits in 5^(n!). %F A385951 a(n) = A055642(A220078(n)). %t A385951 Array[Floor[#! Log10@5+1]&,22] %Y A385951 Cf. A055642, A220078. %Y A385951 Subsequence of A210435. %K A385951 nonn,base %O A385951 0,3 %A A385951 _Vincenzo Librandi_, Jul 27 2025