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>
| 640: | \[L_{640}\] | 40961 × 119809 × 6780056714526721<16> × 8200100029286401<16> × 151654236902860817921<21> × 4698167634523379875583<22> × 952510147649352149463041<24> × 305157902492334788859520001<27> |