The sum of the aliquot divisors of 
, given by
 |
where 
is the divisor function. The first few values
are 0, 1, 1, 3, 1, 6, 1, 7, 4, 8, 1, 16, ... (OEIS A001065).
Restricted Divisor Function
See also
Divisor FunctionExplore with Wolfram|Alpha
References
Sloane, N. J. A. Sequence A001065/M2226 in "The On-Line Encyclopedia of Integer Sequences."Referenced on Wolfram|Alpha
Restricted Divisor FunctionCite this as:
Weisstein, Eric W. "Restricted Divisor Function." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/RestrictedDivisorFunction.html