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 A368611 #7 Jan 01 2024 22:28:27
%S A368611 0,1,3,6,9,15,19,26,32,40,45,58,64,75,86,99,106,123,131,149,163,177,
%T A368611 186,212,224,240,255,277,287,316,327,351,369,388,406,441,453,474,494,
%U A368611 528,541,578,592,622,651,675,690,737,756,788,812,845,861,903,927,969,995,1022
%N A368611 a(n) = Sum_{k=1..n} pi(k) * floor(n/k).
%F A368611 a(n) = A013939(n) + A368613(n).
%t A368611 Table[Sum[PrimePi[k] Floor[n/k], {k, n}], {n, 100}]
%Y A368611 Cf. A000720 (pi), A013939, A046992, A368610, A368612, A368613.
%K A368611 nonn,easy
%O A368611 1,3
%A A368611 _Wesley Ivan Hurt_, Dec 31 2023