Spookily similar to Problem 381 ("Angle between two vectors")....
select the primes of a vector
Calculate Amount of Cake Frosting
Find the Oldest Person in a Room
GJam 2017 Kickstart: Vote (Small)
Tiles Contest: Perfect Solutions for Large Unique Tile Boards
Slitherlink I: Trivial
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GJam: 2013 China Event: Name Sorting
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