Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 133: | \[{20^{133}-1\over19}\] | 19 × 29 × 71 × 2129 × 32719 × 75368484119<11> × 192696104561<12> × 6174163589791<13> × 8776164666072488886789698957877451<34> × 2672419181885638588413640317577254742085726012350062127894360278809061606258187035774281129<91> |