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OpenStudy (anonymous):
positive integer is perfect or not
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OpenStudy (across):
A perfect number is one for which the sum of all its divisors is twice the number.
OpenStudy (anonymous):
en.wikipedia.org/wiki/Perfect_number http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&ved=0CDsQFjAF&url=http%3A%2F%2Fmathworld.wolfram.com%2FPerfectNumber.html&ei=2dR2UKW9HIuY9QSMu4DgAw&usg=AFQjCNEDi3NQ7puAK4mUJIhip4yM-l2gAg&sig2=LT9rn9HDbhv2-sZzbkvLuQ
OpenStudy (nory):
6 is perfect because 1 + 2 + 3 + 6 = 12 = 2 * 6.
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