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  • 02-09-2015
  • Mathematics
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a number smaller than 19 that has more factors than 21 23 25

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  • 10-08-2017
21 has four factors: 1, 3, 7 and 21. 23 is a prime number so it only has two factors: 1 and 23. 25 has three factors: 1, 5 and 25. To fulfil the criteria, therefore, a number must be smaller than nineteen and have more than four factors. Such numbers include 12, 16 and 18.
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