67661

This number is a composite.

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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]

Submitted: 2004-08-24 14:16:26; Last Modified: 2008-01-30 17:28:00.