31
31是30搭32之间个自然数。
- 第11个素数。前一个为29、下一个为37。
- 中心三角形数、中心五边形数、中心十边形数。
- 镓个原子序数。
- 阳历中1月、3月、5月、7月、8月、10月搭12月个天个数目。
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