Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 441: | \[{21^{441}-1\over20}\] | 43 × 127 × 463 × 631 × 883 × 2647 × 3319 × 4789 × 6427 × 7057 × 17053 × 51787 × 370441 × 417187 × 1287133 × 1519099 × 85775383 × 98077519 × 227633407 × 22125429901<11> × 1606344741163<13> × 1767442850839<13> × 27186384126763<14> × 100595851688887003<18> × 266450990381897623<18> × 1703751007820049542146461103<28> × 7511823115405357369289846817961357<34> × 17460141974669146302241107654783887359178281<44> × 744870333519874894118193158181235311168888373<45> × 48357712689725409562634243372243402694009522711593553474560083960477165425983465836249819985891965708281230907031<113> × [1239886449589419470132553816729401850139501241999261216255148935536031324555680123863385770712306920233720011796138563015252795783135051178341064352379<151>] |