## Long Products

### Problem 452

Published on Saturday, 28th December 2013, 01:00 pm; Solved by 278; Difficulty rating: 45%Define F(`m`,`n`) as the number of `n`-tuples of positive integers for which the product of the elements doesn't exceed `m`.

F(10, 10) = 571.

F(10^{6}, 10^{6}) mod 1 234 567 891 = 252903833.

Find F(10^{9}, 10^{9}) mod 1 234 567 891.