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 A023736 #13 Feb 23 2019 21:48:16 %S A023736 93,218,343,393,418,443,453,458,463,465,466,467,469,473,493,593,718, %T A023736 843,968,1018,1043,1068,1078,1083,1088,1090,1091,1092,1094,1098,1118, %U A023736 1218,1343,1468,1593,1643,1668,1693,1703,1708 %N A023736 Numbers with exactly 3 3's in their base-5 expansion. %H A023736 Nathaniel Johnston, <a href="/A023736/b023736.txt">Table of n, a(n) for n = 1..10000</a> %p A023736 seq(`if`(numboccur(3,convert(n,base,5))=3,n,NULL),n=0..2000); # _Nathaniel Johnston_, Jun 27 2011 %t A023736 Select[ Range[ 1750 ], (Count[ IntegerDigits[ #, 5 ], 3 ]==3)& ] %Y A023736 Cf. A023733, A023734, A023735. %K A023736 nonn,base,easy %O A023736 1,1 %A A023736 _Olivier Gérard_