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 A032953 #18 Jul 23 2025 04:43:17
%S A032953 1,2,3,5,6,8,9,10,11,15,16,17,18,19,20,24,25,26,27,29,30,32,33,35,45,
%T A032953 47,48,50,51,53,54,56,57,59,60,62,72,74,75,77,78,80,81,82,83,87,88,89,
%U A032953 90,91,92,96,97,98,99,100,101,105,106,107,135
%N A032953 Numbers whose base-3 representation Sum_{i=0..m} d(i)*3^(m-i) has even d(i) for all odd i.
%C A032953 The i's are indexed at zero. - _Harvey P. Dale_, Aug 03 2021
%H A032953 Harvey P. Dale, <a href="/A032953/b032953.txt">Table of n, a(n) for n = 1..1000</a>
%t A032953 Select[Range[150],AllTrue[Take[IntegerDigits[#,3],{2,-1,2}],EvenQ]&] (* _Harvey P. Dale_, Aug 03 2021 *)
%Y A032953 Disjoint with A033054.
%K A032953 nonn,base
%O A032953 1,2
%A A032953 _Clark Kimberling_
%E A032953 Definition corrected by _Sean A. Irvine_, Nov 17 2020