OFFSET
1,1
COMMENTS
A002635(a(n)) = 4.
LINKS
D. H. Lehmer, On the Partition of Numbers into Squares, The American Mathematical Monthly, Vol. 55, No.8, October 1948, pp. 476-481.
MATHEMATICA
f[n_]:=Length@PowersRepresentations[n, 4, 2]; Select[Range@850, f@#==4 &] (* Vincenzo Librandi, Oct 28 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert Price, Oct 26 2017
STATUS
approved