Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
141: | \[{20^{141}-1\over19}\] | 421 × 1129 × 4889 × 790551835729<12> × 1930941642781<13> × 87910897915022054334374219609<29> × 83956558156098889105419680100622902899696263817011<50> × 5603803142534154347440575080572697963602222648003165314358382754858271<70> |