This number is a composite.

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456 = sigma ( prime(4)^2 + prime(5)^2 + prime(6)^2 ). Note that 456 is the largest number with this property and there is only two numbers with this property. [Firoozbakht]

Submitted: 2004-09-03 05:04:58;   Last Modified: 2008-01-30 11:28:00.
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