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%I #9 Dec 08 2018 11:38:58
%S 5,41,197,44683,360979,3619807,5353841,25106701,47525059,159781073,
%T 188024357,243458497,445838927,1015334371,2018174117,2079737563,
%U 4925466041,5294877781,6383922529,6531129499,6680974507,7635495793
%N Primes of the form A322420(k) or the sum of the first k*(k+1) primes.
%H Ray Chandler, <a href="/A322421/b322421.txt">Table of n, a(n) for n = 1..1000</a>
%F a(n) = A007504(A002378(A322422(n))) = A322420(A322422(n)).
%t f[n_] := Sum[Prime[k], {k, n}]; Select[
%t Table[f[n*(n + 1)], {n, 0, 240}], PrimeQ]
%Y Cf. A002378, A007504, A322420, A322422.
%K nonn
%O 1,1
%A _Ray Chandler_, Dec 07 2018
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