Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 540: | \[{21^{540}-1\over20}\] | 22 × 5 × 11 × 13 × 17 × 19 × 31 × 37 × 41 × 61 × 109 × 163 × 181 × 199 × 211 × 271 × 421 × 463 × 541 × 613 × 1693 × 2551 × 3181 × 5077 × 9391 × 17497 × 18181 × 40841 × 68041 × 185641 × 501001 × 658261 × 1360861 × 4779433 × 41489011 × 57815101 × 85775383 × 920421641 × 4344847859197<13> × 7429452749713<13> × 192787782171121<15> × 1053606939618901<16> × 7101932659132249<16> × 22554946693833031<17> × 360697466924286697<18> × 41764164884102175841<20> × 50412477805825103461<20> × 2447244788249267691839821<25> × 82207575664095002495707981<26> × 2810321698513575079231344181<28> × 1103447100998503280657719551313<31> × 5025685538274553858725665771221<31> × 387296681442215139403864858966948878324061<42> × 146423430319065376948022824274753063043474241<45> × 335762586163588511737475534667790066590701118595773133381<57> × 384473692135100574059360415883054799029026247559713850344212031<63> × 9941772528981582062545534422231276954418444098822221087488059884274141591225068530744235281<91> |