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Talk:Polygonal numbers

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FYI: the Index to OEIS prescribes "9-gon(al)" rather than "nonagon(al)", and similarly k-gon(al) for any k > 8.

Charles R Greathouse IV 05:24, 12 October 2012 (UTC)

What about those two cases:
"12-gon(al)" or "dodecagon(al)"?
"20-gon(al)" or "icosagon(al)"?
Also, for "9-gon(al)" "enneagon(al)" is more consistent in the use of Greek roots for the names of polygons ("nonagon(al)" uses a Latin root instead).
Weisstein, Eric W., Nonagon, from MathWorld—A Wolfram Web Resource.
Daniel Forgues 06:04, 12 October 2012 (UTC)
Use numbers for those as well: 12-gonal, 20-gonal. See Index to OEIS: Section 1 , Index to OEIS: Section 2, Index to OEIS: Section Do.
Charles R Greathouse IV 14:40, 12 October 2012 (UTC)