Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
103: | \[{20^{103}-1\over19}\] | 619 × 1074432643259<13> × 4115434523032449785948580135200269<34> × 1950070948916965761846787847690605126973611643746068035040182756758421447344488707729<85> |