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 A039558 #12 Nov 03 2024 14:31:25 %S A039558 131,142,275,286,419,430,563,574,707,718,851,862,995,1006,1139,1150, %T A039558 1283,1294,1427,1438,1451,1463,1475,1487,1499,1511,1523,1535,1547, %U A039558 1559,1572,1573,1574,1575,1576,1577,1578,1579,1580,1581,1594,1606 %N A039558 Numbers whose base-12 representation has the same nonzero number of 10's and 11's. %t A039558 Select[Range[2000],DigitCount[#,12,10]==DigitCount[#,12,11]>0&] (* _Harvey P. Dale_, Nov 03 2024 *) %K A039558 nonn,base,easy %O A039558 1,1 %A A039558 _Olivier Gérard_