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Line 8: The [[parity (mathematics)\|parity]] of nonagonal numbers follows the pattern odd-odd-even-even. ~~The [[Digital root]] pattern for nonagonal numbers, repeating every nine terms, as shown above, is "1, 9, 6, 1, 3, 3, 1, 6, 9" the total of which is [[39 (number)\|39]].~~ ==Relationship between nonagonal and triangular numbers==

Nonagonal number: Difference between revisions