| 单词 | pentagonal number |
| 释义 | > as lemmaspentagonal number pentagonal number n. any of the series of polygonal numbers (see polygonal adj. 2) 1, 5, 12, 22, 35, 51, 70, 92, etc., obtained by continued summation of the arithmetical series 1, 4, 7, 10, 13, 16, etc., each of which can be represented according to a certain rule by a pattern of dots in the form of a regular pentagon.extracted from pentagonaladj.n.< as lemmas |
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