Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 171: | \[{5^{171}-1\over4}\] | 192 × 31 × 191 × 829 × 6271 × 3981071 × 11735415506748076408140121<26> × 160886188043803054530871719304783265100827282810075925369403839312088918579<75> |