Ugly numbers are those whose prime factors are 2, 3 or 5.
find the nth ugly number.
n.b. unlike the previous problem,trivial solution might not work in this case.
Remove the vowels
Back to basics 9 - Indexed References
Edges of a n-dimensional Hypercube
Integer sequence - 2 : Kolakoski sequence
Calculate the centroid of a triangle
Connect Four - 02
The End of the World
Hanging cable - 02
remove numbers from a string
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