Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 188: | \[{20^{188}-1\over19}\] | 3 × 7 × 401 × 1129 × 4889 × 6863 × 64109 × 637455173 × 790551835729<12> × 1930941642781<13> × 4378474774721<13> × 5634378340885013<16> × 87910897915022054334374219609<29> × 267067556675321437729722313331881<33> × 117607651830033471085155671900584513818329244290849<51> × 1523201995370741149853911341808474202883334149728543<52> |