Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 220: | \[{19^{220}-1\over18}\] | 23 × 52 × 112 × 23 × 151 × 181 × 661 × 911 × 2251 × 104281 × 774797 × 62060021 × 16936647121<11> × 25279866481<11> × 253239693257<12> × 484536191701<12> × 150669382018464871<18> × 439458669164322281<18> × 48381877771677135533<20> × 897434095443561438837961170946421<33> × 2762720155370058278742863792112809157901<40> × 272643515739729963752115465874279238487974845392517778849696269539382181<72> |