Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 84: | \[{28^{84}-1\over27}\] | 3 × 5 × 13 × 29 × 43 × 113 × 157 × 271 × 281 × 631 × 757 × 2269 × 13007 × 29443 × 35771 × 47221 × 93913 × 132679 × 749729 × 4422461 × 1100860153 × 40860961267393<14> × 14070581691669049<17> × 223934956756993189<18> |