0,2

Table of n, a(n) for n=0..104.

Index entries for sequences related to sums of squares

a(25)=4 since 25 = 5^2 = 3^2+4^2 = (-4)^2+(-3)^2 = (-5)^2.

If a(n) is zero then n is in A062863, otherwise in A062861. If a(n) is odd then n is in A006331.

Sequence in context: A124539 A249094 A096501 * A206799 A084119 A166073

Adjacent sequences: A062859 A062860 A062861 * A062863 A062864 A062865

nonn

Henry Bottomley, Jun 25 2001

approved