1 We have a history of attitude-behavior consistency. 2  The attitudes are based on personal experience, rather than being copied from others. 3  The attitudes are proven by past experience. 4  There is no social desirability bias, where the presence of others will lead us into uncharacteristic behavior.
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Perfect number. Perfect number, a positive integer that is equal to the sum of its proper divisors. The smallest perfect number is 6, which is the sum of 1, 2, and 3. Other perfect numbers are 28, 496, and 8,128. The discovery of such numbers is lost in prehistory. It is known, however, that the Pythagoreans (founded c. 525 bc) studied perfect numbers for their âmysticalâ properties.