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We found 4 dictionaries that define the word Pell number:

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

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

Definitions from Wiktionary (Pell number)

noun:  (mathematics, number theory) An infinite sequence of integers that comprises the denominators of the closest rational approximations to the square root of 2.

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