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.
Read a column of numbers and interpolate missing data
Return the Fibonacci Sequence
Split a string into chunks of specified length
Divisible by 5
Rotate a matrix without using rot90
find subscripts from linear index
Hanging cable - 02
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