A322421 Primes of the form A322420(k) or the sum of the first k*(k+1) primes.

5, 41, 197, 44683, 360979, 3619807, 5353841, 25106701, 47525059, 159781073, 188024357, 243458497, 445838927, 1015334371, 2018174117, 2079737563, 4925466041, 5294877781, 6383922529, 6531129499, 6680974507, 7635495793

Offset: 1

Author

Ray Chandler, Dec 07 2018

Keywords

• nonn

Links

• Ray Chandler, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A002378, A007504, A322420, A322422.

Programs

Mathematica

f[n_] := Sum[Prime[k], {k, n}]; Select[
Table[f[n*(n + 1)], {n, 0, 240}], PrimeQ]

Formula

a(n) = A007504(A002378(A322422(n))) = A322420(A322422(n)).