Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 480: | \[{28^{480}-1\over27}\] | 3 × 52 × 11 × 13 × 17 × 29 × 31 × 41 × 61 × 97 × 157 × 193 × 241 × 271 × 601 × 757 × 1861 × 4621 × 7321 × 14561 × 15601 × 15991 × 29201 × 41641 × 45541 × 47221 × 53951 × 59809 × 84961 × 614657 × 637421 × 734941 × 2012449 × 2449561 × 4338337 × 33806737 × 51605161 × 84673681 × 139422721 × 168542177 × 365764369 × 670580641 × 688406401 × 7257822361<10> × 22223646961<11> × 235210745761<12> × 2863024493281<13> × 4411542432420060881<19> × 383290827691270854721<21> × 1228279101647209944401<22> × 4670645471285868887850684885028561<34> × 20373094654699866379529360122950128475486289921<47> × 1082893082282889700216982389251618301675096307172709246600747626946115521<73> × 415062985810458893409554726039367877606025720816476704242996094661583034284973255027593379841<93> × [7834049061534950246175530589035103988778297748954894694007730804313537024492583125033468752063568287619028133397660452773686075275980071796310163672368519361<157>] |