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'.
Longest Divisor Run
Project Euler: Problem 7, Nth prime
Swap the input arguments
Is this matrix orthogonal?
Approximate the inverse tangent by power series
Get the mean digit
Say type of roots in quadratic equation
Ratio between sum of primes and sum of factors
Double the next!
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