Pentagonal Number/Examples
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Definition
The first few pentagonal numbers are as follows:
Sequence of Pentagonal Numbers
The sequence of pentagonal numbers, for $n \in \Z_{\ge 0}$, begins:
- $0, 1, 5, 12, 22, 35, 51, 70, 92, 117, 145, 176, \ldots$
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $15$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $15$
- 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): pentagonal number
- 2021: Richard Earl and James Nicholson: The Concise Oxford Dictionary of Mathematics (6th ed.) ... (previous) ... (next): pentagonal number