Markoff-Rosenberger triples with Fibonacci components

Abstract

. We characterize the solutions of the Markoff-Rosenberger equation ax 2 + by 2 + cz 2 = dxyz with a,b,c,d ∈ Z , gcd( a,b ) = gcd( a,c ) = gcd( b,c ) = 1 and a,b,c | d , for which ( x,y,z ) = ( F i ,F j ,F k ) , where F n denotes the n -th Fibonacci number for any integer n ≥ 0 .