2357
This number is a prime.
Just showing those entries submitted by 'Homewood': (Click here to show all)
(2+3+5-7), (2+3-5+7), (2-3+5+7), (2+3+5+7), (2*3*5-7), (2*3*5+7) and (2+3*5*7) are all prime. [Homewood]
In a list of centered hexagonal numbers, the 2nd, 3rd, 5th and 7th are all Mersenne prime exponents. [Homewood]
(There is one curio for this number that has not yet been approved by an editor.)
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