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 A374195 #11 Jul 01 2024 03:50:38
%S A374195 0,0,3,4,0,12,21,24,36,0,55,60,78,84,75,112,136,144,171,100,210,220,
%T A374195 253,264,250,312,351,364,406,300,465,480,528,544,525,612,666,684,741,
%U A374195 600,820,840,903,924,900,1012,1081,1104,1176,1000,1275,1300,1378,1404,1375
%N A374195 Row sums of A373917.
%H A374195 Paolo Xausa, <a href="/A374195/b374195.txt">Table of n, a(n) for n = 1..10000</a>
%F A374195 a(n) = Sum_{k=1..n-1} (k*10 mod n).
%t A374195 Table[Total[Mod[Range[10, 10*(n-1), 10], n]], {n, 100}]
%Y A374195 Cf. A373917.
%K A374195 nonn,easy,base
%O A374195 1,3
%A A374195 _Paolo Xausa_, Jun 30 2024