Usually means: Number abundant but not semiperfect.
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We found 5 dictionaries that define the word weird number:

General (2 matching dictionaries)
  1. weird number: Wiktionary
  2. Weird number: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. weird number: Encyclopedia

Science (2 matching dictionaries)
  1. Weird Number: Eric Weisstein's World of Mathematics
  2. weird number: PlanetMath Encyclopedia

Definitions from Wiktionary (weird number)

noun:  (number theory) A natural number that is abundant but not semiperfect; one for which the sum of the proper divisors (including 1 but not itself) is greater than the number, but no subset of those divisors sums to the number itself.

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