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438th Lucas Number

438th Number in the Lucas Number Sequence = 24893677995851695395061591712608896875850555449371181438711037372178370103971256950553836461

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.