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 A043447 #14 Nov 27 2024 18:04:20 %S A043447 438,950,1462,1974,2486,2998,3126,3190,3254,3318,3382,3446,3462,3470, %T A043447 3478,3486,3494,3502,3504,3505,3506,3507,3508,3509,3511,3518,3574, %U A043447 4022,4534,5046,5558,6070,6582,7094,7222,7286,7350 %N A043447 Numbers having three 6's in base 8. %H A043447 Robert Israel, <a href="/A043447/b043447.txt">Table of n, a(n) for n = 1..10000</a> %p A043447 filter:= proc(n) numboccur(6, convert(n, base, 8)) = 3 end proc:select(filter, [$1..10000]); # _Robert Israel_, Nov 27 2024 %Y A043447 Cf. A007094. %K A043447 nonn,base,look %O A043447 1,1 %A A043447 _Clark Kimberling_