For this case, a number is defined ugly if it has prime factors consisting of only elements of x.
Find the nth ugly number.
so the ans is 15.
Unlike the previous two "ugly()" problems, in this one it appears that the number "1" is not considered ugly.
Which values occur exactly three times?
Renaming a field in a structure array
Least common multiple of many numbers
Scoring for oriented dominoes
Swap two numbers
ZigZag - 05
Connect Four - 03
Don't be Greedy!
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