OFFSET
1,2
COMMENTS
Differs from A085263 where the square cannot be zero.
LINKS
Jorge Urroz, Every integer can be written as a square plus a squarefree, arXiv:2010.15580 [math.NT], 2020.
PROG
(PARI) a(n) = sum(k=0, n, issquare(k) * issquarefree(n-k));
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Marcus, Oct 31 2020
STATUS
approved