Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 165: | \[{20^{165}-1\over19}\] | 112 × 31 × 61 × 251 × 331 × 421 × 661 × 859 × 991 × 3001 × 79531 × 261451 × 2209901 × 68047805101<11> × 10778947368421<14> × 45302186062321<14> × 2571413672161047121<19> × 175462044485240500219<21> × 167103718909962607171187251<27> × 5248515081374779239217243799310421<34> × 301448967063447759597770509975821331<36> |