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Old 02-01-2011, 06:38 PM
osreb osreb is offline
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Default 70/100

100 can be expressed as a sum of some of its divisors making it a semi-perfect number.
100 is divisible by the number of primes below it (25) making it a polygonal number.
100 is divisible by the sum of its digits (in both base 10 and base 4) making it a Harshad
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