Given four coordinates, write a function to check if they form a square on the XY plane.
Select every other element of a vector
Most nonzero elements in row
The Goldbach Conjecture, Part 2
Sum of the Matrix Elements
Largest Prime Number
Ratio between sum of primes and sum of factors
Sum of a geometric series
Get the mean digit
Approximate the inverse tangent by power series
Ratio between sum of primer numbers and non-prime numbers
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