👉 In mathematics, a costious number is a positive integer that is greater than 1 and whose prime factors are less than its square root. Specifically, a costious number is defined as an integer that has no more than two distinct prime factors. For example, the costious numbers from 2 to 50 are: - 2: 2 - 3: 3 - 5: 5 - 7: 7 - 11:
