Kaprekar Number
Consider an 
-digit number 
. Square it and add the right digits to the left or 
digits. If theresultant sum is , then is called a Kaprekar number. The first few are 1, 9, 45, 55, 99, 297, 703, ... (Sloane's A006886).
See also Digital Root, Digitaddition, Happy Number, Kaprekar Routine, Narcissistic Number,Recurring Digital Invariant
References
Sloane, N. J. A. SequenceA006886/M4625in ``An On-Line Version of the Encyclopedia of Integer Sequences.''http://www.research.att.com/~njas/sequences/eisonline.html and Sloane, N. J. A. and Plouffe, S.The Encyclopedia of Integer Sequences. San Diego: Academic Press, 1995.
- Great Dodecahemidodecacron
- Great Dodecahemidodecahedron
- Great Dodecicosacron
- Great Dodecicosahedron
- Great Dodecicosidodecahedron
- Greater
- Greater Than/Less Than Symbol
- Greatest Common Denominator
- Greatest Common Divisor
- Greatest Common Divisor Theorem
- Greatest Common Factor
- Greatest Integer Function
- Greatest Lower Bound
- Greatest Prime Factor
- Great Hexacronic Icositetrahedron
- Great Hexagonal Hexecontahedron
- Great Icosacronic Hexecontahedron
- Great Icosahedron
- Great Icosahedron-Great Stellated Dodecahedron Compound
- Great Icosicosidodecahedron
- Great Icosidodecahedron
- Great Icosihemidodecacron
- Great Icosihemidodecahedron
- Great Inverted Pentagonal Hexecontahedron
- Great Inverted Retrosnub Icosidodecahedron