PlanetMath:

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0 - 5 entries

1 - 12 entries

2 - 22 entries

3 - 10 entries

4 - 6 entries

4-color conjecture (=four-color conjecture) owned by bbukh

4D-animated representation owned by bci1

4 exponentials (=four exponentials conjecture) owned by Kevin OBryant

4 surface bundles owned by juanman

4th quadrant (in quadrant) owned by Mathprof

proof that $4^x$

exceeds the product of the primes up to $x$

owned by PrimeFan

5 - 4 entries

6 - 2 entries

9 - 2 entries

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