Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 111: | \[{28^{111}-1\over27}\] | 3 × 149 × 223 × 271 × 1481 × 15319 × 20129 × 1072039 × 1883671 × 36129368689<11> × 5478984908421979<16> × 362872981217703889717460874623<30> × 892190545523723188553274916000742618629671530524374780485069957246360089<72> |