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 A115298 #23 Jan 05 2019 13:56:12
%S A115298 1,3,7,13,21,31,43,55,73,91,115,139,165,193,227,263,301,339,381,423,
%T A115298 471,517,569,625,685,745,809,871,937,1011,1089,1167,1247,1335,1425,
%U A115298 1515,1611,1707,1809,1915,2023,2135,2249,2363,2479,2601,2735,2865,2997,3129
%N A115298 Row sums of A115297.
%H A115298 Muniru A Asiru, <a href="/A115298/b115298.txt">Table of n, a(n) for n = 1..3000</a>
%F A115298 a(n) = Sum_{k=2..n+1} (A000040(k) - A000040(ceiling(k/2))). - _Jon Maiga_, Jan 04 2019
%p A115298 a:=n->add(ithprime(k)-ithprime(ceil(k/2)),k=2..n+1): seq(a(n),n=1..60); # _Muniru A Asiru_, Jan 04 2019
%t A115298 Accumulate[Table[Prime[n] - Prime[Ceiling[n/2]], {n, 2, 51}]] (* _Jon Maiga_, Jan 04 2019 *)
%Y A115298 Cf. A115297, A000040, A000166, A008276.
%K A115298 easy,nonn
%O A115298 1,2
%A A115298 _André F. Labossière_, Jan 19 2006
%E A115298 More terms from _André F. Labossière_, Mar 27 2006