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>
| 420: | \[L_{420}\] | 2 × 72 × 23 × 167 × 241 × 2161 × 14503 × 20641 × 65740583 × 118021448662479038881<21> × 13076262780531942679085440491796970310241<41> |