Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 610: | \[{21^{610}-1\over20}\] | 2 × 5 × 11 × 367 × 15373 × 40841 × 47581 × 49411 × 75641 × 112241 × 185641 × 12519763 × 15569711981<11> × 1128331159687<13> × 132538677158969693<18> × 1814065850324073713<19> × 6603983842892247521<19> × 37376752870606823789<20> × 1680017342424658398961<22> × 9600772802405878717656259<25> × 57398774322642953389748085156004642469<38> × 24184943674373446542966753167454474048171258454156601178571420165207208246197721834050525894224889604277228381605403800340320636360297938244040813131698908363388030468679077431379464109296710865701950757928486016366330198709178903310857958593805118311484915351323305570201004676096640491<287> × [651931515467108294732282458658159904901882518094311979856221194890683664987905666506760613186398488556546836324607545894013486690165398469882484166777827916722411076296025598787758893747280176160897822962689892033347355185165015874698064578296448211727047265682048718904979134218383288759499701<294>] |