Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 133: | \[{5^{133}-1\over4}\] | 191 × 6271 × 9311 × 19531 × 65171 × 281429 × 3981071 × 3257947519 × 152317058321<12> × 29090007107767075239783794592001366542871<41> |