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.
Replace multiples of 5 with NaN
Given a 4x4 matrix, swap the two middle columns
Side of an equilateral triangle
Hanging cable - 02
How many ways?
Spiral Out - 02
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