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10/16/2007

November 3–November 9, 2009

Problem

How many 10-digit numbers are there with all digits different that are divisible by 11111?

Solution

List of solvers

Arthur J. Amende, Huy Hoang-Nguyen (undergrad); Mike Goodman, Isaac Abraham, Congpa You, Qiyuan Wei, Lincoln Atkinson, Lloyd Sakazaki (outside).

Congpa You wins the prize!