2187
The digits in the number 2187 form the two Vampire Numbers: 
and
.
References
Gardner, M. ``Lucky Numbers and 2187.'' Math. Intell. 19, 26-29, Spring 1997.
- Planar Bubble Problem
- Planar Distance
- Planar Graph
- Planar Point
- Planar Space
- Planar Straight Line Graph
- Plancherel's Theorem
- Planck's Radiation Function
- Plane
- Plane Curve
- Plane Cutting
- Plane Division
- Plane-Filling Curve
- Plane-Filling Function
- Plane Geometry
- Plane Partition
- Plane Symmetry Groups
- Planted Planar Tree
- Plastic Constant
- Plat
- Plateau Curves
- Plateau's Laws
- Plateau's Problem
- Platonic Solid
- Plato's Number