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• (-1,0,1)-Matrix
• (-1,1)-Matrix
• 0
• (0,1)-Matrix
• 0,1-Simple Lattice
• (0,2)-Graph
• 0-Connected
• 0=1
• 0-Free
• 1
• 1-Connected
• 1 Equals 0
• 1 Equals 2
• 1-Factor
• 1-Planar Graph
• 2
• 2-Form
• 2-Planar Graph
• 2-Vector
• 2x mod 1 Map
• 3
• 3, 4, 5 Triangle
• 3n+1 Problem
• 3x+1 Mapping
• 4
• 4-D Geometry
• 4-Dimensional Geometry
• 4/n Problem
• 5
• 5-Cell
• 6
• 6 Degrees of Separation Phenomenon
• 6-Sphere Coordinates
• 7
• 8-Cell
• 10
• 10 Pins
• 11-Cell
• 12
• 13
• 13th Root
• 15 Puzzle
• 15 Schoolgirl Problem
• 16-Cell
• 17
• 17-gon
• 17-Point Cubic
• 18-Point Problem
• 24
• 24-Cell
• 30-60-90 Triangle
• 36 Officer Problem
• 42
• 45-45-90 Triangle
• 57-Cell
• 60-60-60 Triangle
• 72 Rule
• 77-Graph
• 120-Cell
• 144
• 163
• 196-Algorithm
• 239
• 243
• 257-gon
• 321 Number
• 321 Prime
• 600-Cell
• 666
• 1729
• 2187
• 65537-gon