Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 460: | \[{21^{460}-1\over20}\] | 22 × 5 × 11 × 13 × 17 × 41 × 47 × 277 × 461 × 599 × 691 × 1381 × 2531 × 11731 × 17021 × 19597 × 40841 × 185641 × 11103481 × 22952851 × 477045301 × 595377311 × 688660481 × 920421641 × 5841401081<10> × 58286351831<11> × 69727564981<11> × 11918195405621<14> × 282924347471791<15> × 1414971741476056541<19> × 2215825387044753577<19> × 139870566115103282847737<24> × 28953262389192509964881741<26> × 3394964812534556016503466037951<31> × 2641770975903509717963660601029203121<37> × 209058863218345220988748673221343512407060674263723023401269471<63> × 162708209139159956445385758966200454982244714891163955510792310084461<69> × 1138080620454974979884869498768118964284569725778938196021895295155592693109737678312549553055639887312847173630244302213461752769211942185878981207571948534633980481901<169> |