Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 492: | \[{21^{492}-1\over20}\] | 22 × 11 × 13 × 17 × 61 × 83 × 421 × 463 × 1231 × 3181 × 1766117 × 14122861 × 83218931 × 17222085343<11> × 153065748541<12> × 914531249431<12> × 52899783148909<14> × 166149756476309<15> × 724099105793113<15> × 278070848980469355337<21> × 342306022057032544447<21> × 1474011104949958983856849<25> × 294168762061816395873078148041249581<36> × 367541000424902470501250402608394113<36> × 380770063539669474313312691529545132713<39> × 33985282117517881270903492784746835442538163<44> × 799071455809679496983356625426375581688059909<45> × 10534031885860928959842755452634273061203152273<47> × 48152932015379839157406236741567598261163445191<47> × [178697039792366598391233422411801568608527534470741347079335301723608033070581463332955407381419429954129527566717136127997188891426553182909694890749966586554551575091946925921<177>] |