OFFSET
1,35
COMMENTS
a(A084864(n)) > 0.
LINKS
Eric Weisstein's World of Mathematics, Diophantine Equation: 2nd Powers.
EXAMPLE
n=770 = 2*19^2 + 3*4^2 = 2*17^2 + 3*8^2 = 2*13^2 + 3*12^2 = 2*1 +
3*16^2, therefore a(770)=4.
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jun 10 2003
STATUS
approved