Length (Number)
The length of a number 
in base 
is the number of Digits in the base- numeral for , given bythe formula
where
is the Floor Function.The Multiplicative Persistence of an -Digit is sometimes also called its length.
- Harmonic System of Points
- Harmonious Graph
- Harnack's Inequality
- Harnack's Theorems
- Harshad Number
- Hartley Transform
- Hart's Inversor
- Hart's Theorem
- HashLife
- Hasse-Davenport Relation
- Hasse Diagram
- Hasse-Minkowski Theorem
- Hasse Principle
- Hasse's Algorithm
- Hasse's Conjecture
- Hasse's Resolution Modulus Theorem
- Hat
- Haupt-Exponent
- Hausdorff Axioms
- Hausdorff-Besicovitch Dimension
- Hausdorff Dimension
- Hausdorff Measure
- Hausdorff Paradox
- Hausdorff Space
- Haversine