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423rd Lucas Number

423rd Number in the Lucas Number Sequence = 18250487254938611555074410636524312658020849229014745928158881386149462839394269270468043

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.