A062862 Number of ways n can be written as the sum of squares of consecutive numbers (possibly including squares of negative numbers).

1, 4, 1, 0, 2, 4, 2, 0, 0, 2, 1, 0, 0, 2, 4, 2, 2, 0, 0, 2, 0, 0, 0, 0, 0, 4, 0, 0, 1, 2, 4, 2, 0, 0, 0, 2, 2, 0, 0, 0, 0, 2, 0, 0, 2, 0, 0, 0, 0, 2, 2, 0, 0, 0, 2, 4, 2, 0, 0, 0, 3, 2, 0, 0, 2, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 4, 2, 0, 0, 0, 2, 4, 2, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0

Offset

0,2

Links

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

Index entries for sequences related to sums of squares

Example

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

Crossrefs

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: A369923 A249094 A096501 * A206799 A084119 A166073

Adjacent sequences: A062859 A062860 A062861 * A062863 A062864 A062865

Keyword

nonn

Author

Henry Bottomley, Jun 25 2001

Status

approved