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 A033067 #20 Jul 23 2025 05:42:53
%S A033067 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,17,19,21,23,25,27,29,31,33,35,37,
%T A033067 39,41,43,45,47,49,51,53,55,57,59,61,63,65,67,69,71,73,75,77,79,81,83,
%U A033067 85,87,89,91,93,95,97,99,101,103,105,107,109,111,113,115
%N A033067 Numbers whose base-16 representation Sum_{i=0..m} d(i)*16^i has odd d(m-i) for all odd i.
%p A033067 q:= n-> (l-> andmap(x-> x::odd, [seq(l[-i], i=2..nops(l), 2)]))(convert(n, base, 16)):
%p A033067 select(q, [$1..115])[]; # _Alois P. Heinz_, Jul 22 2025
%Y A033067 Disjoint with A032966 if more than 1 digit.
%K A033067 nonn,base
%O A033067 1,2
%A A033067 _Clark Kimberling_
%E A033067 Definition corrected by _R. J. Mathar_ and _Alois P. Heinz_, Jul 22 2025