67661
This number is a composite.
Just showing those entries submitted by 'Firoozbakht': (Click here to show all)
67661 = prime(6!+6!2) + prime(7!+7!2) + prime(6!+6!2) + prime(6!+6!2) + prime(1!+1!2). Note that 67661 is the only number with this property. [Firoozbakht]
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