Give the sum of the first 'n' terms of a geometric series, given 'a' as the first term and 'r' as the ratio.
Flip the main diagonal of a matrix
Implement simple rotation cypher
Permute diagonal and antidiagonal
Matrix Construction I
Check if is a square
Approximate the inverse tangent by power series
Ratio between sum of primer numbers and non-prime numbers
Ratio between sum of primes and sum of factors
Get the value 100
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