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perfect number
per·fect num·ber (plural per·fect num·bers)


noun 
Definition:
 
kind of whole number: a positive whole number that is equal to the sum of the numbers that can be multiplied to give it as a result, excluding itself
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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