The length of a number 
in base 
is the number of digits in the base-
numeral for 
, given by the formula
 |
where 
is the floor function.
The multiplicative persistence of an 
-digit is sometimes
also called its length.
Number Length
See also
Concatenation, Digit, Figures, Multiplicative PersistenceExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Number Length." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/NumberLength.html