Give the sum of the first 'n' terms of a geometric series, given 'a' as the first term and 'r' as the ratio.
Return the largest number that is adjacent to a zero
Extract leading non-zero digit
Triangle Numbers Below N
Produce a cosine wave
Add 3 numbers
Double the next!
Alternating 1´s and 0´s in a matrix
Get the value 100
Approximate the inverse tangent by power series
Ratio between sum of primes and sum of factors
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