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Problem #91

The Girdle of Hippolyta

The story

Ares had once gifted Hippolyta, the queen of the amazons, a girdle -- a belt. It is this belt that Hercules is now tasked to steal. But, when word of his task spread to the queen herself, she was very impressed with Hercules’ bravery and offered to give him the belt if he won a game of skill against her.

The game

Let s_i = {a_j} = {\frac{1}{(2 - \frac{i}{9})n-1}} be a series for each i, 0 \leq i \leq 7.

And consider I_n = \int_{0}^{\infty} \prod_{j=1}^{n} \frac{sin(a_jx)}{a_jx}dx for each s_i.

As an example, let’s play the game with i=0. Here, I_1 = I_2 = \dots = I_7, but I_7 \neq I_8. Each I_n is of the form \frac{p}{q}\pi. We say the value of s_0 is 8+p+q (8 being the first integral to break the pattern).

Play the game with all the indicated values of i. Add together the values of each s_i and submit this sum modulo 1000000007 as the answer.

Contributed by Project Gauss

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