This problem is exactly the same as the next one, "Go to the head of the class!"
Find the peak 3n+1 sequence value
Project Euler: Problem 4, Palindromic numbers
Project Euler: Problem 5, Smallest multiple
Back to basics - mean of corner elements of a matrix
Find the nearest prime number
Rolling maximums above a threshold
Breaking Out of the Matrix
Fun with a compass
The cake is a lie...
Points on a Sphere
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