MathDB
Product of differences divisible by 1991

Source:

April 19, 2013

Problem Statement

Find the smallest positive integer nn having the property that for any nn distinct integers a1,a2,…,ana_1, a_2, \dots , a_n the product of all differences ai−aja_i-a_j (i<j)(i < j) is divisible by 19911991.
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