tables > lucas

Lucas Sequence

Defined with \(L_0=2\), \(L_1=1\), and \(L_n=L_{n-1}+L_{n-2}\) when \(n\geq2\). Related to the Fibonacci sequence.

Table

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Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>

221: \[L_{221}\] 521 × 3571 × 2337127044022973021<19> × 3531495042124863863141<22>

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