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>
| 684: | \[L_{684}\] | 2 × 7 × 23 × 1367 × 62929 × 103681 × 250343 × 480167 × 307826903 × 22905724967<11> × 1091346396980401<16> × 65494688793368423<17> × 509359556421483451770068101495923382461043707085095635591958006289<66> |