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>
219: | \[L_{219}\] | 22 × 439 × 151549 × 11899937029<11> × 12748437199<11> × 145282738021003201<18> |