英语词汇“triangular numbers”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	triangular numbers
释义	triangular numbers noun plural : the successive sums n(n + 1)/2 where n = 1, 2, 3, ... of the first n natural numbers 1, 3, 6, 10, 15, … representable by dots arranged in triangles
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