Persistent Number
An 
-persistent number is a Positive Integer 
which contains the digits 0, 1, ..., 9, and for which 
,..., 
also share this property. No 
-persistent numbers exist. However, the number 
is2-persistent, since 
but 
, and the number 
is 18-persistent. There existsat least one -persistent number for each Positive Integer .
References
Honsberger, R. More Mathematical Morsels. Washington, DC: Math. Assoc. Amer., pp. 15-18, 1991.
- Banach Measure
- Banach Space
- Banach-Steinhaus Theorem
- Banach-Tarski Paradox
- Bang's Theorem
- Bankoff Circle
- Banzhaf Power Index
- Barber Paradox
- Barbier's Theorem
- Bare Angle Center
- Bar (Edge)
- Barnes G-Function
- Barnes' Lemma
- Barnes-Wall Lattice
- Barnsley's Fern
- Bar Polyhex
- Bar Polyiamond
- Barrier
- Barth Decic
- Barth Sextic
- Bartlett Function
- Barycentric Coordinates
- Baseball
- Baseball Cover
- Base Curve