Base 22 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 58: | \[{22^{58}-1\over21}\] | 23 × 59 × 428041 × 88987603 × 120593021 × 2283673499 × 15141642169<11> × 2501713355621<13> × 64052303668365610463<20> |