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 A045214 #15 May 21 2023 00:19:36 %S A045214 125,250,375,626,627,628,630,635,640,650,675,700,750,875,1000,1251, %T A045214 1252,1253,1255,1260,1265,1275,1300,1325,1375,1500,1625,1876,1877, %U A045214 1878,1880,1885,1890,1900,1925,1950,2000,2125,2250 %N A045214 Numbers whose base-5 representation contains exactly three 0's and no 4's. %C A045214 Subset of A031473. - _R. J. Mathar_, Oct 20 2008 %t A045214 Select[Range[2500],DigitCount[#,5,0]==3&&DigitCount[#,5,4]==0&] (* _Harvey P. Dale_, May 25 2016 *) %Y A045214 Cf. A007091. %K A045214 nonn,base %O A045214 1,1 %A A045214 _Clark Kimberling_