Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 472: | \[{20^{472}-1\over19}\] | 3 × 7 × 401 × 709 × 1889 × 4721 × 160001 × 11560933 × 32031477011<11> × 2505995335981<13> × 32918292739957<14> × 60435208609469<14> × 3309464239815913<16> × 50552666868943321<17> × 10819692258230350553<20> × 4443043113983919668779<22> × 594796417554507257525081<24> × 18125089740981918851143613362611829740110227944229<50> × 1369179763419338592589837489227272683410286422082537721<55> × 15903930044823218118630473140438215500707417264159317312676215460605606768401<77> × [216131327140282360869237099453644141324135949563520190495894683206108430263317276560343467846127596043886783820962086498741777538228830565611090355175342969606365319673328344586856936119445160279292104520356201324323573529762132140431090217192885278068317354161<261>] |