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>
| 666: | \[L_{666}\] | 2 × 33 × 107 × 443 × 11987 × 844489 × 8524801 × 55927129 × 6870470209<10> × 8336942267<10> × 81143477963<11> × 88206892917077483<17> × 368041410331291672883<21> × 8228672565068555947268935981252735539241<40> |