# Problem 211: Divisor Square Sum
For a positive integer n, let σ2(n) be the sum of the squares of its
divisors. For example, σ2(10) = 1 + 4 + 25 + 100 = 130. Find the sum of
all n, 0 < n < 64,000,000 such that σ2(n) is a perfect square.