40
This number is a composite.
Just showing those entries submitted by 'Schiffman': (Click here to show all)
40!+39!+38!+...+3!+2!+1!+0!+1!+2!+3!+...+38!+39!+40! is prime. [Schiffman]
(There is one curio for this number that has not yet been approved by an editor.)
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