Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 495: | \[{20^{495}-1\over19}\] | 112 × 31 × 61 × 199 × 251 × 331 × 421 × 661 × 859 × 991 × 3001 × 10891 × 53101 × 79531 × 261451 × 2209901 × 64008001 × 68047805101<11> × 79083953101<11> × 10778947368421<14> × 45302186062321<14> × 3994611390415801<16> × 2571413672161047121<19> × 7250334619259124361<19> × 175462044485240500219<21> × 575740439805243250891<21> × 167103718909962607171187251<27> × 5248515081374779239217243799310421<34> × 12992593428389191667383293584162419<35> × 301448967063447759597770509975821331<36> × 445857960156220211502282409711073343103021<42> × 29980049642881511878228438683349784587199434897212506807782108773467904729182224186464601131322182110207104778761<113> × [1296487571789154469924939955605354005561299993323437794425198036260708400323406612638516680041642405434954448052977604535405669586827483609521872345980823801<157>] |