2012 IMO Problems/Problem 6: Difference between revisions
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==Problem== | |||
Find all positive integers <math>n</math> for which there exist non-negative integers <math>a_1, a_2, \ldots, a_n</math> such that | Find all positive integers <math>n</math> for which there exist non-negative integers <math>a_1, a_2, \ldots, a_n</math> such that | ||
<cmath> | <cmath> | ||
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\frac{1}{3^{a_1}} + \frac{2}{3^{a_2}} + \cdots + \frac{n}{3^{a_n}} = 1. | \frac{1}{3^{a_1}} + \frac{2}{3^{a_2}} + \cdots + \frac{n}{3^{a_n}} = 1. | ||
</cmath> | </cmath> | ||
Revision as of 11:50, 21 June 2018
Problem
Find all positive integers 
for which there exist non-negative integers 
such that
![\[\frac{1}{2^{a_1}} + \frac{1}{2^{a_2}} + \cdots + \frac{1}{2^{a_n}} = \frac{1}{3^{a_1}} + \frac{2}{3^{a_2}} + \cdots + \frac{n}{3^{a_n}} = 1.\]](http://latex.artofproblemsolving.com/b/0/f/b0fa90026dcd8289f99183337e2bfd121077dd0f.png)
