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 A109722 #16 Sep 29 2023 14:24:48
%S A109722 0,5,17,41,77,129,197,281,381,501,639,791,963,1161,1371,1593,1851,
%T A109722 2127,2427,2747,3087,3447,3831,4227,4661,5117,5589,6081,6601,7141,
%U A109722 7699,8275,8893,9523,10191,10887,11599,12339,13101,13887,14697,15537,16401,17283
%N A109722 Sum of first 2n primes.
%C A109722 Bisection of A007504.
%H A109722 Ray Chandler, <a href="/A109722/b109722.txt">Table of n, a(n) for n = 0..10000</a>
%H A109722 Romeo Meštrović, <a href="https://arxiv.org/abs/1804.04198">Curious conjectures on the distribution of primes among the sums of the first 2n primes</a>, arXiv:1804.04198 [math.NT], 2018.
%F A109722 a(n) = A007504(2n).
%t A109722 f[n_] := Sum[Prime[k], {k, n}]; Table[f[2n], {n, 0, 43}]
%t A109722 Join[{0},With[{nn=100},Take[Accumulate[Prime[Range[nn]]],{2,nn,2}]]] (* _Harvey P. Dale_, Dec 20 2021 *)
%Y A109722 Cf. A007504, A109723, A109724, A109725, A109726.
%K A109722 easy,nonn
%O A109722 0,2
%A A109722 _Giovanni Teofilatto_, Aug 10 2005
%E A109722 Edited and extended by _Ray Chandler_, Aug 11 2005