Introduce coprime/relative integer #238
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Scientific background: https://en.wikipedia.org/wiki/Coprime_integers
In my humble opinion lack of such important function in this library is kind of misunderstanding. I cannot imagine how much frustration may it cause to current and future users.
The reason I'm making such mind shortcut with this calculation is supported by studies that
13is prime number so non-relative non-primes are only numbers that are multiplication ofthirteen.I hope this will help.
Regards, Rafal