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How many counting numbers less than 20 have an odd amount of factors?

How many counting numbers less than 20 have an odd amount of factors?
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4 votes
How many counting numbers less than 20 have an odd amount of factors?

User Andrew Halloran
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2 Answers

3 votes
1,3,5,7,9,11,13,15,17,19
User Melroy Van Den Berg
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8.4k points
0 votes
1,3,5,7,9,11,13,14,15,17,19 11 numbers
User Rafeek
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7.5k points
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