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 A031473 #9 Jul 04 2021 18:27:42 %S A031473 125,250,375,626,627,628,630,635,640,650,675,700,750,875,1000,1251, %T A031473 1252,1253,1255,1260,1265,1275,1300,1325,1375,1500,1625,1876,1877, %U A031473 1878,1880,1885,1890,1900,1925,1950,2000,2125,2250 %N A031473 Numbers whose base-5 representation has 3 more 0's than 4's. %t A031473 Select[Range[2300],DigitCount[#,5,0]==DigitCount[#,5,4]+3&] (* _Harvey P. Dale_, Jul 23 2012 *) %Y A031473 Cf. A007091. %K A031473 nonn,base %O A031473 1,1 %A A031473 _Clark Kimberling_