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 A347912 #4 Sep 18 2021 21:55:02
%S A347912 1,2,3,5,6,8,9,11,14,15,17,20,21,23,26,30,31,33,36,40,41,43,46,50,55,
%T A347912 56,58,61,65,70,71,73,76,80,85,91,92,94,97,101,106,112,113,115,118,
%U A347912 122,127,133,140,141,143,146,150,155,161,168,169,171,174,178,183,189,196,204
%N A347912 a(n) = Sum_{k=1..n} k - floor(sqrt(k)+1/2) * floor(sqrt(k-1)).
%C A347912 Partial sums of A122197.
%t A347912 Table[Sum[k - Floor[Sqrt[k] + 1/2]*Floor[Sqrt[k - 1]], {k, n}], {n, 100}]
%Y A347912 Cf. A122197.
%K A347912 nonn,easy
%O A347912 1,2
%A A347912 _Wesley Ivan Hurt_, Sep 18 2021