Difference between revisions of "1990 AHSME Problems/Problem 11"

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How many positive integers less than 50 have an odd number of positive integer divisors?
 
How many positive integers less than 50 have an odd number of positive integer divisors?
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Revision as of 13:50, 5 July 2013

How many positive integers less than 50 have an odd number of positive integer divisors? These problems are copyrighted © by the Mathematical Association of America, as part of the American Mathematics Competitions. AMC Logo.png