Give the sum of the first 'n' terms of a geometric series, given 'a' as the first term and 'r' as the ratio.
Project Euler: Problem 9, Pythagorean numbers
Sum the numbers on the main diagonal
What is Sum Of all elements of Matrix
Replace Nonzero Numbers with 1
Check if is a square
Get the value 100
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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