== Multiplicative and additive functions == An arithmetic function a is Two whole numbers m and n are called coprime if their greatest common divisor is 1; i.e., if there is no prime number that divides both of them. Then an arithmetic function a is It is often convenient to write this as an infinite product over all the primes, where all but a fi...
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http://en.wikipedia.org/wiki/Arithmetic_function
any mathematical function defined for integers (…, 3, 2, 1, 0, 1, 2, 3, …) and dependent upon those properties of the integer itself as a number, in ...
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http://www.britannica.com/eb/a-z/a/100
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