Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 106: | \[{28^{106}-1\over27}\] | 29 × 107 × 220187971 × 2336285687 × 309617974423<12> × 22296760665788211056355688793755535283785281059280783<53> × 8418181933268901359893212846689066832649574728174313094689465758991<67> |