Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 555: | \[{20^{555}-1\over19}\] | 11 × 31 × 61 × 251 × 421 × 2221 × 3001 × 4441 × 65269 × 261451 × 3065081 × 3147961 × 65986171 × 207561121 × 897307351 × 2889957151 × 31957654090711<14> × 55042837737661<14> × 131302879073281<15> × 100102805287820551<18> × 40600782778641592009<20> × 703019090959433724181<21> × 970145700460507134358284075031<30> × 90910834157713672270611495786161<32> × 383493384240205993228059557962159<33> × 768714606845763128001167284536739<33> × 46316244393048193396307696583011007091<38> × 143759993025672204517453984936257853699831<42> × 528965363091966279232277362744898488284918005263441<51> × 3091164456295978041937747100334541971583772189031871<52> × 65293339249810416755952570081257478405389800471368307854169149305328181<71> × 1337505423512594642887170446719722087942027990181129588714906234444850517724187227986938422091972837639123062474562622136608850496538682898159118575485162486244836711<166> |