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>
| 648: | \[L_{648}\] | 2 × 47 × 1103 × 3023 × 19009 × 68687 × 447901921 × 10749957121<11> × 48265838239823<14> × 18821014311299403023<20> × 856532133777030350222881<24> × 1731407737563604036770895447081913182731841<43> |