9

This number is a composite.

Just showing those entries submitted by 'Hartley': (Click here to show all)

+ 2^^n-9 = 2^(2^(2^(....(2^2)...)))-9 is (for large enough n) always divisible by both 7 and 11. Note that 9 is midway between 7 and 11. [Hartley]

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