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491st Lucas Number

491st Number in the Lucas Number Sequence = 2967795697064976427862421836334141336150900792786444618288545455102252664927332007624673682829385529104

In general, the nth term is given by f(n-1)+f(n-2)

To understand this sequence and how it differs from the Fibonacci series, you might find it useful to read the Lucas Sequence tutorial over here.