An Idoneal number is a positive integer \( n \) such that the equation \( x^2 - n y^2 = 1 \) has a solution in integers \( (x, y) \). This is a specific case of Pell's equation, which is generally of the form \( x^2 - D y^2 = 1 \) for some positive integer \( D \).

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