Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 370: | \[{20^{370}-1\over19}\] | 3 × 7 × 11 × 61 × 149 × 251 × 4441 × 65269 × 82141 × 152381 × 368447 × 3065081 × 3147961 × 65986171 × 207561121 × 2889957151 × 131302879073281<15> × 9609038940231949<16> × 124065005275823894023123<24> × 90910834157713672270611495786161<32> × 383493384240205993228059557962159<33> × 46316244393048193396307696583011007091<38> × 123984589236096864025203993537748125012766434779701<51> × 2059354461192110355197188570792264485636255462970901<52> × 65293339249810416755952570081257478405389800471368307854169149305328181<71> × 1116476897151410706954039207911929161394635612704717234209979514922842003500054081<82> |