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 A004225 #12 May 27 2024 11:00:20 %S A004225 0,301,477,602,698,778,845,903,954,1000,1041,1079,1113,1146,1176,1204, %T A004225 1230,1255,1278,1301,1322,1342,1361,1380,1397,1414,1431,1447,1462, %U A004225 1477,1491,1505,1518,1531,1544 %N A004225 a(n) = 1000*log_10(n) rounded down. %t A004225 Floor[1000 Log10[Range[40]]] (* _Harvey P. Dale_, May 27 2024 *) %Y A004225 Cf. A004226, A004227. %Y A004225 Cf. A004216, A004219, A004222, A004228. %K A004225 nonn %O A004225 1,2 %A A004225 _N. J. A. Sloane_