Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 320: | \[{28^{320}-1\over27}\] | 52 × 11 × 17 × 29 × 41 × 61 × 97 × 157 × 241 × 641 × 7681 × 14561 × 15601 × 29201 × 41641 × 53951 × 84961 × 614657 × 637421 × 2012449 × 4338337 × 7734913 × 13430849 × 168542177 × 22223646961<11> × 88984704961<11> × 2863024493281<13> × 2716827163186049<16> × 72183193582863809<17> × 4411542432420060881<19> × 383290827691270854721<21> × 1228279101647209944401<22> × 1082893082282889700216982389251618301675096307172709246600747626946115521<73> × 5572044840632148442391668441028779775911900051789966436956458938968016641<73> × 70570346468427602849186693182378386808626219951852781595043652553992441176325245406147252154561<95> |