Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 145: | \[{20^{145}-1\over19}\] | 11 × 59 × 61 × 251 × 929 × 10789 × 143609 × 466307299 × 42516584771<11> × 71353204641689<14> × 286934932103531<15> × 2511778854830594606611<22> × 312853876283494435841671<24> × 692012806659357739574341<24> × 19840908591991639613963221<26> × 374751027121579773391551841<27> |