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.
Find the longest sequence of 1's in a binary sequence.
Tell me the slope
Is this matrix orthogonal?
Return the first and last character of a string
Find a Pythagorean triple
ZigZag - 04
Game of life - 01
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