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.
Make a checkerboard matrix
Return the largest number that is adjacent to a zero
Project Euler: Problem 8, Find largest product in a large string of numbers
Divisible by 5
Sum of logarithms
Sum of series
Connect Four - 01
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