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From: alainverghote on 15 Jul 2010 13:04 Good afternoon, We might also study equations like x^2 + y^2 = z^2 + 1 and equalities such as (4n(n+1))^2+(4n^3+6n^2-1)^2 = (2n(n+1)(2n+1))^2 + 1 Have a look at Tito Piezas site! Alain |