Update README.md

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@ -4,6 +4,7 @@ An arithmetic derivative calculator that uses these simple formulas:
* 0' = 1' = 0; * 0' = 1' = 0;
* if n is a prime, n' = 1; * if n is a prime, n' = 1;
* if n = ab (a and b > 1), n' = a'b + ab' * if n = ab (a and b > 1), n' = a'b + ab'
* (-n)' = -(n')
More about arithmetic derivative: More about arithmetic derivative:
https://en.wikipedia.org/wiki/Arithmetic_derivative https://en.wikipedia.org/wiki/Arithmetic_derivative