Difference between revisions of "2012 IMO Problems/Problem 6"

 
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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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</cmath>
 
</cmath>
  
Proposed by Dusan Djukic, Serbia
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==Solution==
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{{solution}}
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==See Also==
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{{IMO box|year=2012|num-b=5|after=Last Problem}}

Latest revision as of 00:29, 19 November 2023

Problem

Find all positive integers $n$ for which there exist non-negative integers $a_1, a_2, \ldots, a_n$ such that \[\frac{1}{2^{a_1}} + \frac{1}{2^{a_2}} + \cdots + \frac{1}{2^{a_n}} =  \frac{1}{3^{a_1}} + \frac{2}{3^{a_2}} + \cdots + \frac{n}{3^{a_n}} = 1.\]

Solution

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See Also

2012 IMO (Problems) • Resources
Preceded by
Problem 5
1 2 3 4 5 6 Followed by
Last Problem
All IMO Problems and Solutions