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>
| 689: | \[L_{689}\] | 521 × 42719 × 119218851371<12> × 114557357776889<15> × 1949248585456901<16> × 1658785314719995177305160344325838496446304635226259547303451013559035144460688265645157963274971<97> |