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.
11 is the largest known multiplicative persistence.
12 is the smallest abundant number.
…

9910 is the number of fixed 9-ominoes.
9912 is the number of graceful permutations of length 14.
9918 is the maximum number of pieces a torus can be cut into with 38 cuts.
9919 can be written as the difference between two positive cubes in more than one way.
9920 is the maximum number of regions a cube can be cut into with 39 cuts.
9928 is a value of n for which reverse(φ(n)) = φ(reverse(n)).
9929 is the number of 3×3 sliding puzzle positions that require exactly 26 moves to solve starting with the hole on a side.
…

Link

Related Leave a Comment