Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 163: | \[{28^{163}-1\over27}\] | 29402949949<11> × 8485249329556067873508962395021922884108111<43> × 13227604448899331171064904622787914036286556031<47> × 76053442545958419120119477496634820650149736467837723361990539953<65> × 11369457831870942222596385209283594436568276392920806337076489837281169<71> |