Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 168: | \[{28^{168}-1\over27}\] | 3 × 5 × 13 × 29 × 43 × 113 × 157 × 271 × 281 × 337 × 449 × 631 × 757 × 2269 × 3361 × 7321 × 13007 × 23633 × 29443 × 35771 × 47221 × 93913 × 132679 × 614657 × 749729 × 4422461 × 51605161 × 54034289 × 213827041 × 1100860153 × 439840060577<12> × 40860961267393<14> × 1043370300810769<16> × 14070581691669049<17> × 223934956756993189<18> × 148193546048624098783489<24> × 16604279565503032045034113<26> |