OFFSET
1,4
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A066339(n^2).
PROG
(PARI) a(n) = sum(k=2, n^2-1, isprime(k)&&k%4==1);
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Oct 06 2021
STATUS
approved