Fibonacci Sequence
Defined with \(F_0=0\), \(F_1=1\), and \(F_n=F_{n-1}+F_{n-2}\) when \(n\geq2\).
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
291: | \[F_{291}\] | 2 × 193 × 389 × 3084989 × 361040209 × 76674415738994499773<20> × 227993117754975870677<21> |