Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 609: | \[{21^{609}-1\over20}\] | 43 × 59 × 463 × 631 × 2437 × 3319 × 4789 × 6427 × 7309 × 227633407 × 576986089 × 1103704099 × 246763300513<12> × 139184658492559<15> × 687613372491653<15> × 349788347199162649<18> × 960400283241933241<18> × 72780729038130238346333869<26> × 7826081384442721874824416529<28> × 7690755329903725696668350079937171<34> × 951363762097381671218323905908798973133<39> × 203252608875340597411995971323532717433013<42> × 13477015991023291802765110016390772920553907009<47> × 1542529703094677555311359180186347885870250840973897401657811561<64> × 7029183543342187602112671458236433457842700010487981785306470361467144480428484963417285888117211334312954552527132795632048544648104731388480382824658303846446320308509906330711855840748787422621<196> × [4438572112981025198565806320053268851577521112383717903962528108743136947823354125151856803338034179058394606586072444160250230213527896321609191779528542384480636290567010899076721240163223857089958653<202>] |