Unlike the previous two "ugly()" problems, in this one it appears that the number "1" is not considered ugly.
Project Euler: Problem 10, Sum of Primes
Back to basics 9 - Indexed References
Numbers with prime factors 2, 3 and 5.
How many trades represent all the profit?
Length of the hypotenuse
An n-sided regular polygon is drawn within a circle whose radius is 'r', what will be the area of the polygon?
Ugly numbers - 01
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