A033790 Product t2(q^d); d | 31, where t2 = theta2(q)/(2*q^(1/4)).

1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn

Comments

Also the number of positive odd solutions to equation x^2 + 31y^2 = 8(n + 4). - Seiichi Manyama, May 21 2017

Links

• Seiichi Manyama, Table of n, a(n) for n = 0..10000

Crossrefs

Cf. A035162, A128617, A033782.

Formula

Expansion of q^(-4) * (eta(q^2) * eta(q^62))^2 / (eta(q) * eta(q^31)) in powers of q. - Seiichi Manyama, May 21 2017

Extensions

More terms from Seiichi Manyama, May 21 2017