Give the sum of the first 'n' terms of a geometric series, given 'a' as the first term and 'r' as the ratio.
Angle between Two Vectors
Getting logical indexes
Return area of square
Vectors counting by 2
Compute LOG(1+X) in natural log
Get the value 100
Double the next!
Get the mean digit
Ratio between sum of primes and sum of factors
Ratio between sum of primer numbers and non-prime numbers
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