Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 53: | \[{28^{53}-1\over27}\] | 220187971 × 8418181933268901359893212846689066832649574728174313094689465758991<67> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 53: | \[{28^{53}-1\over27}\] | 220187971 × 8418181933268901359893212846689066832649574728174313094689465758991<67> |