A075406 a(n) is the number of terms in the sum in A075405 (or 0 if no such square exists).

24, 0, 2, 0, 0, 0, 23, 0, 24, 0, 22898, 0, 96, 0, 97, 0, 23, 11, 0, 2, 96, 59, 0, 0, 24, 0, 33, 50, 0, 169, 0, 578, 0, 0, 0, 0, 0, 11, 0, 0, 0, 0, 0, 24, 0, 0, 0, 0, 0, 122, 0, 96, 0, 0, 3479, 0, 0, 2075, 0, 33, 0, 0, 0, 242, 218, 0, 50, 0, 0, 0, 0, 0, 122, 36481, 0, 24, 0, 0, 0, 0, 0, 0, 194, 0, 0, 0, 50, 0, 0, 0, 242, 0, 0, 0, 0, 0, 0, 0, 0, 0

Offset: 1

Author

Zak Seidov, Sep 13 2002

Keywords

• nonn

Comments

Note that a(n) is either 0 or a number in A001032.

Examples

			a(1) = 25 because the sum 1^2+...+24^2 consists of 25 terms, see A075404.
		

References

• See A180422.

Crossrefs

Cf. A000330, A075404, A075405.

Programs

Mathematica

s[n_, k_]:=Module[{m=n+k-1}, (m(m+1)(2m+1)-n(n-1)(2n-1))/6]; mx=40000; Table[k=2; While[k
				

Extensions

Corrected and extended by Lior Manor, Sep 19 2002

Corrected and edited by T. D. Noe, Jan 21 2011