Knowing that 123-45-67+89=100, write a function that gives this result for any order of the digits in the input. Otherwise, the function should give 'NaN'.
Find all elements less than 0 or greater than 10 and replace them with NaN
Project Euler: Problem 6, Natural numbers, squares and sums.
Approximate the inverse tangent by power series
Ratio between sum of primes and sum of factors
Double the next!
Alternating 1´s and 0´s in a matrix
Ratio between sum of primer numbers and non-prime numbers
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