Average order of an arithmetic function information
In number theory, an average order of an arithmetic function is some simpler or better-understood function which takes the same values "on average".
Let be an arithmetic function. We say that an average order of is if
as tends to infinity.
It is conventional to choose an approximating function that is continuous and monotone. But even so an average order is of course not unique.
In cases where the limit
exists, it is said that has a mean value (average value) . If in addition the constant is not zero, then the constant function is an average order of .
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