Idoneal numbers: Difference between revisions
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'''[[wp:
A positive integer '''n''' is idoneal if and only if it cannot be written as '''ab + bc + ac''' for distinct positive integers '''a''', '''b''', and '''c''' with '''0 < a < b < c'''.
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;See also
;* [[wp:
;* [[oeis:A000926|OEIS:A000926 - Euler's "numerus idoneus" (or "numeri idonei", or idoneal, or suitable, or convenient numbers)]]
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