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>
| 621: | \[L_{621}\] | 22 × 19 × 139 × 461 × 691 × 5779 × 6211 × 1485571 × 49747069 × 9558326431<10> × 4502371768977478951<19> × 3643684402534298380040912641<28> × 4317955187747400582308395358110028036528959<43> |