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>
| 685: | \[L_{685}\] | 11 × 61651 × 86311 × 541721291 × 2384201411 × 78982487870939058281<20> × 1132237871637335834441376449277007640583391<43> × 21210322898595512545212317979521045368629826238406521<53> |