Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 580: | \[{21^{580}-1\over20}\] | 22 × 5 × 11 × 13 × 17 × 41 × 59 × 349 × 1277 × 1451 × 5801 × 18097 × 36541 × 40841 × 185641 × 1504231 × 920421641 × 1103704099 × 128843888881<12> × 246763300513<12> × 687613372491653<15> × 1578452085743581<16> × 1792484183066669<16> × 10560867746962116514771<23> × 7865855595529911658005355038639053<34> × 9759093518513238012039627213817579718073176623974473<52> × 21933305517206008074555499460677419485784113293205521<53> × 33516108735906048319408808055288256871397516473638732084022278909501<68> × 242279377536202385586187110393058417545371939488428667089127727948835374510815298411385558004749924867591610694978830839143398404310985718431<141> × [127734321920292527710291605383501165389726702552881500633390626881024145857439767514711488836025421990807452292165718729514892237136895982523708252492026816637069377494430649466907645629889481928231182996876354069589360825646228134353947976953417393214916023216605181<267>] |