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Date: 21-11-2020
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There are several results known as the Morgado identity. The first is
(1) |
where is a Fibonacci number and is a Lucas number (Morgado 1987, Dujella 1995).
A second Morgado identity is satisfied by generalized Fibonacci numbers ,
(2) |
where
(3) |
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(4) |
(Morgado 1987, Dujella 1996).
REFERENCES:
Dujella, A. "Diophantine Quadruples for Squares of Fibonacci and Lucas Numbers." Portugaliae Math. 52, 305-318, 1995.
Dujella, A. "Generalized Fibonacci Numbers and the Problem of Diophantus." Fib. Quart. 34, 164-175, 1996.
Morgado, J. "Note on Some Results of A. F. Horadam and A. G. Shannon Concerning a Catalan's Identity on Fibonacci Numbers." Portugaliae Math. 44, 243-252, 1987.
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