6

This number is a composite.

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

+ The proper factors of 6 are 1, 2 and 3. Note that 2*6^3-1, 2*6^3+1, 3*6^2-1 and 3*6^2+1 are all prime numbers. [Hartley]

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