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>
| 638: | \[L_{638}\] | 3 × 43 × 307 × 347 × 1270083883 × 61861940956201<14> × 19989455841535200486182533980671340646159599962343519917463836931033414123698249926192254599593331071801<104> |