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.
Determine whether a vector is monotonically increasing
Compute a dot product of two vectors x and y
Divisible by 5
Even or Odd
Count the days
No of squares in a grid
check whether a number is a pentatope number
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