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We found 4 dictionaries that define the word Vampire number:

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

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

Definitions from Wiktionary (vampire number)

noun:  (mathematics) A composite natural number with an even number of digits that can be factored into two natural numbers (called "fangs") each with half as many digits as the original number, and where the two factors contain precisely all the digits of the original number, in any order, counting multiplicity.

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