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>
280: | \[L_{280}\] | 47 × 1601 × 3041 × 6135922241<10> × 10745088481<11> × 164154312001<12> × 13264519466034652481<20> |