Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 70: | \[{28^{70}-1\over27}\] | 11 × 29 × 71 × 113 × 211 × 2521 × 13007 × 35771 × 53951 × 59221 × 206501 × 637421 × 4422461 × 31384274881<11> × 2005875869991701<16> × 99885743242098024883367081<26> |