Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
113: | \[{20^{113}-1\over19}\] | 2053005947539<13> × 1055739390077562445885478999<28> × 25216742053690826851385731641839583568602676821457684036686275636550830533061584837395209468563118833549361<107> |