Nonagonal Number
المؤلف:
Sloane, N. J. A
المصدر:
Sequences A001106/M4604, A028991, and A028992 in "The On-Line Encyclopedia of Integer Sequences."
الجزء والصفحة:
...
19-12-2020
1256
Nonagonal Number
A polygonal number of the form 
, also called an enneagonal number. The first few are 1, 9, 24, 46, 75, 111, 154, 204, ... (OEIS A001106). The generating function for the nonagonal numbers is
The first few odd nonagonal numbers are 1, 9, 75, 111, 261, 325, ... (OEIS A028991), and the first few even nonagonal numbers are 24, 46, 154, 204, 396, ... (OEIS A028992).
REFERENCES:
Sloane, N. J. A. Sequences A001106/M4604, A028991, and A028992 in "The On-Line Encyclopedia of Integer Sequences."
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