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 A045205 #13 May 21 2023 00:20:52 %S A045205 124,249,374,499,549,574,599,609,614,619,621,622,623,874,999,1124, %T A045205 1174,1199,1224,1234,1239,1244,1246,1247,1248,1499,1624,1749,1799, %U A045205 1824,1849,1859,1864,1869,1871,1872,1873,2124,2249 %N A045205 Numbers whose base-5 representation contains no 0's and exactly three 4's. %C A045205 Subset of A031476. - _R. J. Mathar_, Oct 20 2008 %Y A045205 Cf. A007091. %K A045205 nonn,base %O A045205 1,1 %A A045205 _Clark Kimberling_