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 A268620 #21 Mar 17 2023 14:33:32 %S A268620 0,4,8,13,17,22,26,31,35,39,40,44,48,53,57,62,66,71,75,79,80,84,88,93, %T A268620 97,103,107,112,116,121,125,129,130,134,138,143,147,152,156,161,165, %U A268620 169,170,174,178,183,187,192,196,202,206,211,215,219,220,224,228,233,237,242,246 %N A268620 Numbers whose digital sum is a multiple of 4. %C A268620 a(1498) = 5999 is the smallest term that is congruent to 5 modulo 9. %H A268620 Robert Israel, <a href="/A268620/b268620.txt">Table of n, a(n) for n = 1..10000</a> %p A268620 select(t -> convert(convert(t,base,10),`+`) mod 4 = 0, [$1..1000]); # _Robert Israel_, Feb 09 2016 %t A268620 Select[Range[0, 250], IntegerQ[Total[IntegerDigits[#]]/4] &] %o A268620 (Magma) [n: n in [0..250] | IsIntegral(&+Intseq(n)/4)]; %Y A268620 Cf. A007953, A061383 (supersequence). %Y A268620 Cf. numbers whose digital sum is a multiple of k: A054683 (k=2), A008585 (k=3), this sequence (k=4), A227793 (k=5). %Y A268620 Subsequences: A002278, A038446, A052218, A052222, A061387, A169967, A235151, A235227, A235229. %K A268620 nonn,base %O A268620 1,2 %A A268620 _Bruno Berselli_, Feb 09 2016