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421st Lucas Number

421st Number in the Lucas Number Sequence = 6971065820139782390806954219541689244276624212074373456653600330331675492690805039973161

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.