MathDB
P 36

Source:

May 25, 2007
Additive Number Theory

Problem Statement

Let kk and ss be odd positive integers such that 3k21s4k.\sqrt{3k-2}-1 \le s \le \sqrt{4k}. Show that there are nonnegative integers tt, uu, vv, and ww such that k=t2+u2+v2+w2,    and    s=t+u+v+w.k=t^{2}+u^{2}+v^{2}+w^{2}, \;\; \text{and}\;\; s=t+u+v+w.