%0 Journal Article %T Estimate of a Trigonometrical Sum Involving Naturals with Binary Decompositions of a Special Kind %A Karen M. Eminyan %J Mathematics %D 2008 %I arXiv %X Let $\mathbb{N}_0$ be a class of natural numbers whose binary decompositions has even number of 1. We estimate of the sum $\sum\limits_{n\in \mathbf{N}_0,n\le X}\exp(2\pi i \alpha n^2)$. %U http://arxiv.org/abs/0805.3923v1