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→Nonagonal numbers: added digital root pattern Tag: Reverted |
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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".
==Relationship between nonagonal and triangular numbers==
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