A075405 a(n)^2 is the square obtained in A075404 (or 0 if no such square exists).

70, 0, 5, 0, 0, 0, 92, 0, 106, 0, 2001863, 0, 652, 0, 679, 0, 138, 77, 0, 29, 724, 413, 0, 0, 182, 0, 253, 385, 0, 1612, 0, 8687, 0, 0, 0, 0, 0, 143, 0, 0, 0, 0, 0, 274, 0, 0, 0, 0, 0, 1281, 0, 1012, 0, 0, 121268, 0, 0, 56855, 0, 440, 0, 0, 0, 3069, 2725, 0, 655, 0, 0, 0, 0, 0, 1525, 4035066, 0, 430, 0, 0, 0, 0, 0, 0, 2619, 0, 0, 0, 795, 0, 0, 0, 3465, 0, 0, 0, 0, 0, 0, 0, 0, 0

Offset: 1

Author

Zak Seidov, Sep 13 2002

Keywords

• nonn

Examples

			a(1) = 70 because 1^2+...+24^2 = a(1)^2 = 70^2.
		

References

• See A180244.

Crossrefs

Cf. A000330, A075404, A075406.

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