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>
| 687: | \[L_{687}\] | 22 × 6871 × 43339382282472497059<20> × 432239751442823624735947140379<30> × 104990418946773667410736999685208265866007631<45> × 6944993144158238896632132845325587544900606541<46> |