sfufoet 在煎蛋厨房里提到这个网页：What’s Special About This Number?

0 is the additive identity.
1 is the multiplicative identity.
2 is the only even prime.

3 is the number of spatial dimensions we live in.
4 is the smallest number of colors sufficient to color all planar maps.
5 is the number of Platonic solids.
6 is the smallest perfect number.

7 is the smallest number of faces of a regular polygon that is not constructible by straightedge and compass.
8 is the largest cube in the Fibonacci sequence.
9 is the maximum number of cubes that are needed to sum to any positive integer.

10 is the base of our number system.
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是不是比较拽？