Problem #171
Random Name
g(x) = 2^{2x^3} - 1
f(x)=\sum_{i=1}^x g(\lfloor\frac xi\rfloor)
F(x)= \sum_{i=1}^x f(i)
Find F(12345678) mod 10^9 +7
g(x) = 2^{2x^3} - 1
f(x)=\sum_{i=1}^x g(\lfloor\frac xi\rfloor)
F(x)= \sum_{i=1}^x f(i)
Find F(12345678) mod 10^9 +7