OFFSET
0,9
COMMENTS
It appears that a(A046174(n)) = 0.
PROG
(PARI) a(n) = sum(k=1, n-1, isprime((2*n^2+2*k*n-k^2-k)/2))
CROSSREFS
KEYWORD
nonn
AUTHOR
Gionata Neri, Jul 08 2018
STATUS
approved