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.
Inner product of two vectors
Project Euler: Problem 7, Nth prime
Sophie Germain prime
Lychrel Number Test (Inspired by Project Euler Problem 55)
CONVERT TAN TO SIN
Tell your secret
How lucky r u ?
Check Digit - 01
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