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 A322421 Primes of the form A322420(k) or the sum of the first k*(k+1) primes. 3
 5, 41, 197, 44683, 360979, 3619807, 5353841, 25106701, 47525059, 159781073, 188024357, 243458497, 445838927, 1015334371, 2018174117, 2079737563, 4925466041, 5294877781, 6383922529, 6531129499, 6680974507, 7635495793 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Ray Chandler, Table of n, a(n) for n = 1..1000 FORMULA a(n) = A007504(A002378(A322422(n))) = A322420(A322422(n)). MATHEMATICA f[n_] := Sum[Prime[k], {k, n}]; Select[ Table[f[n*(n + 1)], {n, 0, 240}], PrimeQ] CROSSREFS Cf. A002378, A007504, A322420, A322422. Sequence in context: A322420 A270165 A270157 * A270211 A270182 A273313 Adjacent sequences:  A322418 A322419 A322420 * A322422 A322423 A322424 KEYWORD nonn AUTHOR Ray Chandler, Dec 07 2018 STATUS approved

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Last modified August 5 07:54 EDT 2021. Contains 346464 sequences. (Running on oeis4.)