Heptagonal numbers

Definition of Heptagonal numbers

(Arith.) the numbers of the series 1, 7, 18, 34, 55, etc., being figurate numbers formed by adding successively the terms of the arithmetical series 1, 6, 11, 16, 21, etc.

See also: Heptagonal

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Hepper
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heptadecanoic acid
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-Heptagonal numbers-
Heptagynia
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Heptahedron
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