Given four coordinates, write a function to check if they form a square on the XY plane.
Select every other element of a vector
Reverse the Words (not letters) of a String
Find nearest prime number less than input number
Circular Primes (based on Project Euler, problem 35)
Divide by 4
Get the mean digit
Approximate the inverse tangent by power series
Ratio between sum of primes and sum of factors
Sum of a geometric series
Ratio between sum of primer numbers and non-prime numbers
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