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 A004223 #8 Oct 24 2023 23:15:30 %S A004223 0,30,48,60,70,78,85,90,95,100,104,108,111,115,118,120,123,126,128, %T A004223 130,132,134,136,138,140,141,143,145,146,148,149,151,152,153,154,156, %U A004223 157,158,159,160,161,162,163,164 %N A004223 a(n) = 100*log_10(n) rounded to the nearest integer. %K A004223 nonn %O A004223 1,2 %A A004223 _N. J. A. Sloane_