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>
| 381: | \[L_{381}\] | 22 × 509 × 3049 × 5081 × 487681 × 7357111 × 13822681 × 19954241 × 1348763794031914156041797647143983548205749<43> |