Test if integer i is a number in the fibonacci sequence. Return true if it is.
Return the 3n+1 sequence for n
Finding Perfect Squares
Doubling elements in a vector
0, 2, 0, -2, 0, 2, 0, -2, ...
Convert Fahrenheit to Kelvin
Check if number is a square number
Calculate days until Christmas
Check if integer is a prime number
Calculate the area of a circle
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