Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 172: | \[{28^{172}-1\over27}\] | 5 × 29 × 157 × 173 × 3613 × 5849 × 60029 × 684217 × 24385817 × 62167681 × 105942074311<12> × 23321405465263<14> × 280931610243662693509<21> × 17068111104046291434149<23> × 6614496361616478724735573264857257<34> × 40848716771148807687245758923041411219985871202629<50> × 1819754817173479521710558023419606630408591326649895876777<58> |