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Problem #335

Power Game

A number x is called powerful if it has 10^9 + 7 digits such that every digit of x is odd, and x \equiv 3125 \pmod{298023223876953125}.

If the total number of powerul natural numbers is A, find A \bmod 10^9 + 7.

Contributed by Rudransh Aggarwal

Solved by 15 users

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