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>
| 644: | \[L_{644}\] | 72 × 14503 × 253367 × 9506372193863<13> × 226267162697288411043007537121178068840738898408489624540478806548617723222230016854949539948545884176294149761<111> |