Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 491: | \[{3^{491}-1\over2}\] | 983 × 24551 × 844124016018569089<18> × 155447385335258570051<21> × 291671294798796604878293546257685321758532280277228977625499001874203904408637427299940848195909297449354999283935995360702618591096672220445292821344833868872336858053772611074999511585279<189> |