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 A341002 #14 Feb 23 2021 05:28:06 %S A341002 1,10,12,21,23,32,34,43,45,54,56,65,67,76,78,87,89,98,100,102,120,201, %T A341002 203,210,223,225,230,232,245,247,252,254,267,269,274,276,289,296,298, %U A341002 302,304,320,322,340,403,405,425,427,430,447,449,450,452,469,472,474,494,496,504 %N A341002 Numbers whose sum of even digits and sum of odd digits differ by 1. %H A341002 Carole Dubois, <a href="/A341002/b341002.txt">Table of n, a(n) for n = 1..5001</a> %t A341002 Select[Range[1000], Abs[Plus @@ Select[(d = IntegerDigits[#]), OddQ] - Plus @@ Select[d, EvenQ]] == 1 &] (* _Amiram Eldar_, Feb 02 2021 *) %Y A341002 Cf. A036301 (sums are equal), A341002 to A341010 (sums differ by 1 to 9). %K A341002 base,nonn %O A341002 1,2 %A A341002 _Eric Angelini_ and _Carole Dubois_, Feb 02 2021