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>
| 642: | \[L_{642}\] | 2 × 32 × 1283 × 21401 × 374929 × 226981241 × 126192465881<12> × 767056342442009<15> × 35826692014602352249<20> × 1014204212177241703695227621874074225127504650393608528866854519123<67> |