Talk:Congruum

216
If the statement that every congruum can be expressed as 4mn(m^2-n^2) is true, how does one represent 216? Sorry if I'm being naïve here, but I can't find a solution. Am I misunderstanding the statement? Pieater3.14159265 (talk) 21:46, 9 July 2015 (UTC)
 * It appears to be a mistake. To get every congruum you might need to multiply an expression of this form by a square. E.g. for 216, you can express 24 as this form, and then multiply by 9. —David Eppstein (talk) 22:58, 9 July 2015 (UTC)

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