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perf.
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Also available:
World English Dictionary
Dictionnaire Français
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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