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>
| 681: | \[L_{681}\] | 22 × 39499 × 5098421 × 286526812459<12> × 349455156811<12> × 4311537234701<13> × 11430850120111<14> × 163183528584704033251<21> × 317351386961794678797301<24> × 101628873094253127040903036515597990049<39> |