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'.
The Goldbach Conjecture
Prime factor digits
So many choices
Create a matrix X, where each column is a shifted copy of the vector v
Ratio between sum of primes and sum of factors
Sum of a geometric series
Say type of roots in quadratic equation
Get the mean digit
Ratio between sum of primer numbers and non-prime numbers
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