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This is Numberphile. We mainly post videos about mathematics and just numbers in general.

17 and Sudoku Clues

17 and Sudoku Clues

17 is the minimum number of clues required to give a unique sudoku solution - but how did mathematicians prove this?

Featuring James Grime.

Dr James Grime discusses a recent paper which cracked the problem. The paper being discussed by McGuire and others is at http://arxiv.org/abs/1201.0749

James Grime's website is at http://singingbanana.com/

Root 2

Root 2

98 and Grafting Numbers

98 and Grafting Numbers