A Sum of the Digits Theorem If you sum the digits of any even perfect number (except 6), then Sum the digits of the resulting number, and repeat this process until you get a single digit, that digit will be 1.
As an example, consider the perfect number 28. The Sum of its digits is 10. The Sum of the digits of 10 is 1. Verify this theorem for each of the following
perfect numbers.
a. 496
b. 8128
c. 33,550,336
d. 8,589,869,056
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