Heptagonal numbers


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Related to Heptagonal numbers: Triangular numbers, Square numbers, Pentagonal 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

References in periodicals archive ?
After this they should go on to establish the hexagonal numbers HX(n) and the heptagonal numbers HP(n).