Q264 Ugly Number II
Q264 Ugly Number II

Write a program to find the n-th ugly number.

Ugly numbers are positive numbers whose prime factors only include 2, 3,
5. For example, 1, 2, 3, 4, 5, 6, 8, 9, 10, 12 is the sequence of the
first 10 ugly numbers.

Note that 1 is typically treated as an ugly number.

robertzm/algotest