Give the sum of the first 'n' terms of a geometric series, given 'a' as the first term and 'r' as the ratio.
Select every other element of a vector
Check if sorted
Project Euler: Problem 1, Multiples of 3 and 5
Ratio between sum of primes and sum of factors
Approximate the inverse tangent by power series
Get the value 100
Check if is a square
Get the mean digit
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