PlanetMath (more info)
 Math for the people, by the people.
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3 - 8 entries
proof that 3 is the only prime perfect totient number owned by PrimeFan
3-manifold owned by juanman
3n+1 problem (=Collatz problem) owned by akrowne
3rd quadrant (in quadrant) owned by Mathprof
3 sides equal trapezium (in isosceles trapezoid) owned by Wkbj79
3-sides-equal trapezium (in isosceles trapezoid) owned by Wkbj79
3 sides equal trapezoid (in isosceles trapezoid) owned by Wkbj79
3-sides-equal trapezoid (in isosceles trapezoid) owned by Wkbj79
4 - 5 entries
5 - 4 entries
6 - 1 entry
9 - 2 entries
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7522 entries total.
12889 concepts total.
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