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>
320: | \[L_{320}\] | 127 × 186812208641<12> × 62379555831803099867272961<26> × 5079180256659675431743744001<28> |