Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 660: | \[{20^{660}-1\over19}\] | 32 × 7 × 112 × 13 × 23 × 31 × 41 × 61 × 67 × 89 × 127 × 251 × 331 × 401 × 421 × 661 × 859 × 991 × 1321 × 2801 × 3001 × 12277 × 27281 × 38149 × 71161 × 72733 × 79531 × 152381 × 222361 × 261451 × 315481 × 1297693 × 2209901 × 3049927 × 7930693 × 55191001 × 167283841 × 26876632021<11> × 58175508161<11> × 68047805101<11> × 170770770413<12> × 424016563147<12> × 4574753733001<13> × 6881957521693<13> × 10778947368421<14> × 14121717629581<14> × 45302186062321<14> × 1373430941347081<16> × 2571413672161047121<19> × 175462044485240500219<21> × 504390604852567932181<21> × 167103718909962607171187251<27> × 8124246482325517139725974241<28> × 46676296576275720360548386813<29> × 5248515081374779239217243799310421<34> × 301448967063447759597770509975821331<36> × 11544868483876542417134734645670674427914239932800021<53> × [3769084062586324275140429689852809877060266241255442800607224196937310884253268555416546846913373936429760954706586667039963663637694128698320010408563938698791245426189358749312453261510071685890069553608256405849615718910672867635619753026348555802798253560351049369611175401775520983280091331876165667332202694175951521<322>] |