Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 67: | \[{19^{67}-1\over18}\] | 588518621 × 1650922227287<13> × 24299939580826833879511<23> × 111718923317519780739416742825495315326353<42> |