OFFSET
0,2
COMMENTS
a(n) is nonzero if and only if n = x^2 + 2*y^2 for some integers x and y if and only if n is in A002479. - Michael Somos, Dec 15 2011
EXAMPLE
All solutions for n=9
...0.0.9...1.4.4...4.4.1...9.0.0
...0.9.0...4.1.4...4.1.4...0.9.0
...9.0.0...4.4.1...1.4.4...0.0.9
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved