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Perfect numbers are numbers where all the factors add to that number. For example 6's factors are 1,2, and 3 and 1+2+3=6. Therefore the next perfect number isn't until 28 which is 1,2, 4, 7, 14 where 1+2+4+7+14= 28

An almost perfect number is a number which, when adding all of its proper divisors (all divisors except himself), gives you one less, or one more then the number itlself. Up to now all known almost perfect numbers are 2^n. So to answer your question, the 2 almost perfect numbers between 5 and 20 are 8 and 16.

Divisors of 8: 1,2,4 -----> 1+2+4=7

Divisors of 16: 1,2,4,8 -----> 1+2+4+8=15

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โˆ™ 2012-09-25 04:10:14
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Q: What are 2 almost perfect numbers between 5 and 20?
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