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
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 686: | \[L_{686}\] | 3 × 281 × 5881 × 3769390267 × 61025309469041<14> × 15518836817864658123547214502261431209<38> × 13109985026466492627065756942405441070544088883610755383156075821807237932227<77> |