Second Pentagonal Number/Sequence
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Sequence of Second Pentagonal Numbers
The sequence of second pentagonal numbers, for $n \in \Z_{\ge 0}$, begins:
- $0, 2, 7, 15, 26, 40, 57, 77, 100, 126, 155, 187, \ldots$
This sequence is A005449 in the On-Line Encyclopedia of Integer Sequences (N. J. A. Sloane (Ed.), 2008).
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $22$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $22$