Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 98: | \[{28^{98}-1\over27}\] | 29 × 113 × 197 × 13007 × 28813 × 35771 × 51647 × 57527 × 2155609 × 4422461 × 248397367 × 319343666713<12> × 5966523512629<13> × 47562389635488030795003583<26> × 44498235948084746667439513476081194102813<41> |