Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 148: | \[{28^{148}-1\over27}\] | 5 × 29 × 149 × 157 × 223 × 1481 × 20129 × 36129368689<11> × 1004690609843<13> × 362872981217703889717460874623<30> × 12034188740195053379860324023109474023287<41> × 156611865441632058174811274386548500584124462524560239195883405209465005136730060097348354595815830932977<105> |