Idoneal numbers: Difference between revisions
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'''[[wp:Idoneal_number|Idoneal numbers]]''' (also called '''suitable''' numbers or '''convenient''' numbers) are the positive integers '''D''' such that any integer expressible in only one way as '''x<sup>2</sup> ± Dy<sup>2</sup>''' (where '''x<sup>2</sup>''' is relatively prime to '''Dy<sup>2</sup>''') is a prime power or twice a prime power.
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