MathDB

6

Part of 2019 Nigeria Senior MO Round 2

Problems(1)

Three square theorem

Source: Nigerian senior mathematics Olympiad round 2 problem 6.

9/8/2019
Let N=4KLN=4^KL where L≡ 7(mod8)L\equiv\ 7\pmod 8. Prove that NN cannot be written as a sum of 3 squares
number theory