Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 226: | \[{20^{226}-1\over19}\] | 3 × 7 × 227 × 1583 × 2053005947539<13> × 714118397870688383<18> × 1952326470639684809<19> × 44624993356391326687993369<26> × 1055739390077562445885478999<28> × 2211885359844801393112993637394310145562997671925382782373917427159538838513487<79> × 25216742053690826851385731641839583568602676821457684036686275636550830533061584837395209468563118833549361<107> |