MathDB
Sum of reciprocals

Source: China TST 2006

June 18, 2006
algebrareciprocal sumExtremal combinatoricsmaximization

Problem Statement

Given positive integer nn, find the biggest real number CC which satisfy the condition that if the sum of the reciprocals of a set of integers (They can be the same.) that are greater than 11 is less than CC, then we can divide the set of numbers into no more than nn groups so that the sum of reciprocals of every group is less than 11.