Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 243: | \[{20^{243}-1\over19}\] | 421 × 1459 × 3889 × 1112941 × 5977801 × 64008001 × 150773239 × 879338701 × 298114935351301<15> × 3360401637336728900281<22> × 6876399306877631706317041<25> × 7599707813206155097384225291<28> × 15721667458073376459082354447584949<35> × 1130994928387487632390874502515505705605883946297522557266674580689<67> × 5925698276179216563833362095433708030169907717164152713744752276608435650584119<79> |