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431st Lucas Number

431st Number in the Lucas Number Sequence = 857384416798688205322146546398461722061337599142249183459012869301255270820177904036305984

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.