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An "almost perfect number" is a type of natural number that is closely related to perfect numbers. A perfect number is a positive integer that is equal to the sum of its proper divisors (excluding itself). For example, 6 is a perfect number because its divisors (1, 2, and 3) add up to 6.

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  1. Integer sequences
  2. Numbers
  3. Arithmetic
  4. Fields of mathematics
  5. Mathematics
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