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
| 单词 | heptagonal numbers | ||
| 释义 | Heptagonal numbers
See also: Heptagonal |
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