Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 309: | \[{20^{309}-1\over19}\] | 421 × 619 × 46351 × 186019 × 423734791 × 1074432643259<13> × 1936589088019<13> × 155852256476728681<18> × 4115434523032449785948580135200269<34> × 1950070948916965761846787847690605126973611643746068035040182756758421447344488707729<85> × [22153170952481050447121827620261857034462214896696385085214545005891153683023311374521575932936508646221488821072705203116783341866911874166561663445753471941945789869256125553293594104549306969049150209289207768860901<218>] |