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Medium
Number games
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Very easy
Who’s using it?
23rd
of
July
2009
Sample challenges
Mathematical
Medium
Sum of 14 elements
23rd
of
July
2009
Sample challenges
Mathematical
Medium
Rectangular grid
23rd
of
July
2009
Sample challenges
Mathematical
Medium
Permutation
23rd
of
July
2009
Sample challenges
Mathematical
Medium
Sum of the factorial
23rd
of
July
2009
Sample challenges
Mathematical
Medium
Consecutive primes
23rd
of
July
2009
Sample challenges
Mathematical
Hard
Euler’s Totient function
23rd
of
July
2009
Sample challenges
Mathematical
Medium
Cube
23rd
of
July
2009
Sample challenges
Mathematical
Easy
Power
23rd
of
July
2009
Sample challenges
Mathematical
Hard
Reduced proper fraction
23rd
of
July
2009
Sample challenges
Mathematical
Hard
Coloured discs
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