Ugly Numbers
Number Theory
Level
2
A number is called an ugly number if its prime factorization only includes powers of 2, 3 or 5. 1 is included in the sequence.which is the 15th ugly number?
The answer is 24.
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1 solution
Why do you call them ugly?
1,2,3,4,5,6,8,9,10,12,15,16,18,20,24. So, 24 is the 15th "ugly" number.