Pentagonal Pyramidal Number

A Pyramidal Number of the form . The first few are 1, 6, 18, 40, 75, ... (Sloane's A002411). TheGenerating Function for the pentagonal pyramidal numbers is

References

Sloane, N. J. A. SequenceA002411/M4116in ``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.

• Nonsquarefree
• Nonstandard Analysis
• Nontotient
• Nonwandering
• Nonzero
• Nordstrand's Weird Surface
• Norm
• Normal
• Normal (Algebraically)
• Normal Curvature
• Normal Curve
• Normal Developable
• Normal Distribution
• Normal Distribution Function
• Normal Equation
• Normal Form
• Normal Function
• Normal Group
• Normalized Vector
• Normalizer
• Normal Magic Square
• Normal Matrix
• Normal Number
• Normal Order
• Normal Plane