Problem 45302. Ugly numbers - 03

Asif Newaz

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For this case, a number is defined ugly if it has prime factors consisting of only elements of x. Find the nth ugly number.

x=[2,3,5] and n=10.
So the list is like -- 2,3,4,5,6,8,9,10,12,15...

so the ans is 15.

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Last Solution submitted on Jan 13, 2026

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William on 1 Feb 2020

Unlike the previous two "ugly()" problems, in this one it appears that the number "1" is not considered ugly.

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