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>
| 555: | \[L_{555}\] | 22 × 11 × 31 × 3331 × 4441 × 146521 × 1121101 × 54018521 × 42567967201<11> × 1241763935281<13> × 265272771839851<15> × 1937097591773821<16> × 2918000731816531<16> × 6856961839926808711<19> |