How many integers between 1000 and 9999, inclusive, have an odd number of positive integer divisors?

Operations Research : Applications and Algorithms
4th Edition
ISBN:9780534380588
Author:Wayne L. Winston
Publisher:Wayne L. Winston
Chapter9: Integer Programming
Section9.7: Implicit Enumeration
Problem 6P
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How many integers between 1000 and 9999, inclusive, have an odd number of positive integer divisors?

 

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