Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 470: | \[{21^{470}-1\over20}\] | 2 × 5 × 11 × 283 × 941 × 1129 × 34781 × 40841 × 49727 × 185641 × 227011 × 8282341 × 10165349 × 32036611 × 58335931 × 75042551 × 158545759 × 5298873343<10> × 230199028303<12> × 8254573388881<13> × 3884209928361279371<19> × 9794718038248648833094153<25> × 264564425522789761284612235919<30> × 12167149921840905775558502408504169011<38> × [89119494984884472798819959173506616430799503640298528559293674943818996843606410688290981246739318005398340208956665564816680012736267861448926493827958104787085575086895191<173>] × 6847542200417623658286640749840415955091782235483838756785987494581852814202162065111680127421360589450531118883189885048745738874371691308843719040047907624465328369267229327176507948728332834799714106958677428458294440041<223> |