For a discrete function 
, the summatory function is defined by
 |
where 
is the domain of the function.
Summatory Function
See also
Divisor Function, Mangoldt Function, Mertens Function, Rudin-Shapiro Sequence, Tau Function, Totient FunctionExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Summatory Function." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/SummatoryFunction.html