Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 282: | \[{21^{282}-1\over20}\] | 2 × 11 × 283 × 421 × 463 × 1129 × 49727 × 188941 × 227011 × 10165349 × 32036611 × 38571961 × 75042551 × 158545759 × 5298873343<10> × 62754239731<11> × 230199028303<12> × 5604507094507<13> × 26050530648193<14> × 471375279539413<15> × 85297241991463563433<20> × 9794718038248648833094153<25> × 264564425522789761284612235919<30> × 16557682722621587651041257050155686425265489802868579623<56> × 43598141472385427990200703008414575176728138639859248875991460020279225134312697137609809864030916067783<104> |