Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 360: | \[{21^{360}-1\over20}\] | 23 × 5 × 11 × 13 × 17 × 19 × 31 × 37 × 41 × 61 × 73 × 181 × 199 × 211 × 421 × 463 × 601 × 613 × 1693 × 2551 × 3181 × 9391 × 18181 × 40841 × 97241 × 185641 × 501001 × 658261 × 816769 × 1360861 × 3441241 × 40086001 × 41489011 × 57815101 × 85775383 × 518118697 × 808208209 × 920421641 × 4344847859197<13> × 415710882920521<15> × 1053606939618901<16> × 22554946693833031<17> × 81967288802253121<17> × 4014083991013398361<19> × 41764164884102175841<20> × 82207575664095002495707981<26> × 84947863319467630678021906123321<32> × 387296681442215139403864858966948878324061<42> × 2135334117016238177166643352711488254647441970164671209065005534916910575135419083785586435904978340252668201<109> |