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 A341004 #12 Feb 22 2021 21:19:28 %S A341004 3,14,25,30,36,41,47,52,58,63,69,74,85,96,104,111,122,140,205,212,221, %T A341004 227,234,243,249,250,256,265,272,278,287,294,300,306,324,342,360,401, %U A341004 407,410,423,429,432,445,454,467,470,476,489,492,498,502,508,520,526,544,562,580 %N A341004 Numbers whose sum of even digits and sum of odd digits differ by 3. %H A341004 Carole Dubois, <a href="/A341004/b341004.txt">Table of n, a(n) for n = 1..5001</a> %t A341004 Select[Range[1000], Abs[Plus @@ Select[(d = IntegerDigits[#]), OddQ] - Plus @@ Select[d, EvenQ]] == 3 &] (* _Amiram Eldar_, Feb 02 2021 *) %Y A341004 Cf. A036301 (sums are equal), A341002 to A341010 (sums differ by 1 to 9). %K A341004 base,nonn %O A341004 1,1 %A A341004 _Eric Angelini_ and _Carole Dubois_, Feb 02 2021