Centered Pentagonal Number
A Centered Polygonal Number consisting of a central dot with five dots around it, and then additional dots in thegaps between adjacent dots. The general term is 
, and the first few such numbers are 1, 6, 16, 31, 51, 76,... (Sloane's A005891). The Generating Function of the centered pentagonal numbers is
See also Centered Square Number, Centered Triangular Number
References
Sloane, N. J. A. SequenceA005891/M4112in ``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.
- Gnomic Number
- Gnomon
- Gnomonic Projection
- Gnomon Magic Square
- G-Number
- Go
- Goblet Illusion
- Goldbach Conjecture
- Golden Mean
- Golden Ratio
- Golden Ratio Conjugate
- Golden Rectangle
- Golden Rule
- Golden Section
- Golden Theorem
- Golden Triangle
- Goldschmidt Solution
- Golomb Constant
- Golomb-Dickman Constant
- Golomb Ruler
- Golygon
- Gomory's Theorem
- Gompertz Constant
- Gompertz Curve
- Gonal Number