Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 58: | \[{28^{58}-1\over27}\] | 292 × 59 × 40427 × 1074509 × 25404189355843522469778697943<29> × 582595509837473004489665028935473297399<39> |