| 词条 | 213 (number) |
| 释义 |
| number = 213 | divisor = 1, 3, 71, 213 }} 213 (two hundred [and] thirteen) is the number following 212 and preceding 214. It is the smallest of a triple consecutive numbers that are products of two distinct prime numbers: 213 = 3 × 71, 214 = 2 × 107, and 215 = 5 × 43.[1] Its square is a sum of distinct factorials: 2132 = 45369 = 1! + 2! + 3! + 7! + 8!.[2] See also
References1. ^{{Cite OEIS|A039833|name=Smallest of three consecutive squarefree numbers n, n+1, n+2 of the form p*q where p and q are primes}}. {{Integers|2}}{{Num-stub}}Nombre 210#Nombres del 211 al 2192. ^{{Cite OEIS|A014597|name=Numbers n such that n^2 is a sum of distinct factorials}}. 1 : Integers |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。