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 A322422 #11 Dec 08 2018 11:40:15
%S A322422 1,2,3,11,18,31,34,49,57,76,79,84,97,118,139,140,172,175,183,184,185,
%T A322422 191,208,218,221,232,233,247,262,266,294,313,315,323,333,334,339,344,
%U A322422 351,361,366,372,407,413,436,445,461,473,478,500,545,546,556,564,577
%N A322422 Numbers k such that the sum of the first k*(k+1) primes is prime.
%H A322422 Ray Chandler, <a href="/A322422/b322422.txt">Table of n, a(n) for n = 1..1000</a>
%F A322422 A322421(n) = A322420(a(n)) = A007504(A002378(a(n))).
%t A322422 f[n_] := Sum[Prime[k], {k, n}]; Select[Range[500],
%t A322422 PrimeQ[f[#*(# + 1)]] &]
%Y A322422 Cf. A002378, A007504, A322420, A322421.
%K A322422 nonn
%O A322422 1,2
%A A322422 _Ray Chandler_, Dec 07 2018