OFFSET
1,2
LINKS
EXAMPLE
5 is a term because the sum of the first five primes (2 + 3 + 5 + 7 + 11 = 28) is a hexagonal number.
MATHEMATICA
A366270list[kmax_]:=Module[{p=0}, Join[{0}, Table[If[IntegerQ[(Sqrt[8(p+=Prime[k])+1]+1)/4], k, Nothing], {k, kmax}]]]; A366270list[10^5]
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Paolo Xausa, Oct 06 2023
STATUS
approved