题目 vjudge URL:Counting Divisors (square) Let σ0(n)\sigma_0(n)σ0(n) be the number of positive divisors of nnn. For example, σ0(1)=1\sigma_0(1) = 1σ0(1)=1, σ0(2)=2\sigma_0(2) = 2σ0(2)=2 and σ0(6)=4\sigma_0(6) = 4σ0(6)=4. Let S2(n)=∑i=1nσ0(i2).S_2(n…