OFFSET
1,1
LINKS
Ray Chandler, Table of n, a(n) for n = 1..1000
MATHEMATICA
f[n_] := Sum[Prime[k], {k, n}]; Select[
Table[f[n*(n + 1)], {n, 0, 240}], PrimeQ]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ray Chandler, Dec 07 2018
STATUS
approved