42 Killed 7 Children Bus Crashes Mountainous Highway Safety Experts Warn Of Deadly Risk Schools Keep Taking With Kids As
42=2\times3\times7 。 42是第三个15边形数。 它和三角形数类似，但基于的是正15边形。 42是超级多重完全数：除数之和的除数之和（包括42），这样重复6次之后的数字等于自己。 在一段.
Melbourne bus crash School children suffer "life changing" injuries
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