A118421 Number of integer solutions to n = x^2 + (2y)^2 + z(z+1)/2.

6, 4, 2, 12, 16, 10, 12, 16, 12, 14, 20, 4, 8, 24, 14, 20, 16, 16, 28, 32, 18, 12, 40, 4, 20, 44, 8, 22, 20, 28, 20, 32, 16, 8, 44, 18, 32, 24, 16, 44, 56, 24, 24, 32, 22, 48, 24, 24, 20, 36, 24, 36, 60, 12, 46, 36, 16, 32, 20, 24, 44, 40, 16, 32, 56, 26, 36, 72, 24, 32, 56, 24

Offset

1,1

Links

Table of n, a(n) for n=1..72.

Eric Weisstein's World of Mathematics, Square-Triangle Theorem

Crossrefs

Cf. A118422, A118423, A118426.

Sequence in context: A345644 A019849 A244685 * A158233 A093604 A011408

Adjacent sequences: A118418 A118419 A118420 * A118422 A118423 A118424

Keyword

nonn

Author

Eric W. Weisstein, Apr 27 2006

Status

approved