Octahedral Number
A Figurate Number which is the sum of two consecutive Pyramidal Numbers,
The first few are 1, 6, 19, 44, 85, 146, 231, 344, 489, 670, 891, 1156, ... (Sloane's A005900). The GeneratingFunction for the octahedral numbers is
See also Truncated Octahedral Number
References
Conway, J. H. and Guy, R. K. The Book of Numbers. New York: Springer-Verlag, p. 50, 1996. Sloane, N. J. A. SequenceA005900/M4128in ``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.
- Equiangular Spiral
- Equianharmonic Case
- Equi-Brocard Center
- Equichordal Point
- Equichordal Problem
- Equidecomposable
- Equidistance Postulate
- Equidistant Cylindrical Projection
- Equidistributed Sequence
- Equilateral Hyperbola
- Equilateral Triangle
- Equilibrium Point
- Equilic Quadrilateral
- Equinumerous
- Equipollent
- Equipotent
- Equipotential Curve
- Equiproduct Point
- Equireciprocal Point
- Equirectangular Projection
- Equiripple
- Equitangential Curve
- Equivalence Class
- Equivalence Problem
- Equivalence Relation