Number TheoryHardHard Number Theory ShareHard Number Theory · Hard problemHow many of the integers 1,2,…,1001, 2, \ldots, 1001,2,…,100 can not be written as x2−y2x^2 - y^2x2−y2 with x,yx, yx,y integers?Check Show answer Walk through it step by step Practice more like this Review this concept