Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 155: | \[{20^{155}-1\over19}\] | 11 × 61 × 251 × 311 × 11161 × 766321 × 1646101 × 2387311 × 102567841 × 340037881769<12> × 581740080393079<15> × 48309707746869061391<20> × 1087505315388920334551<22> × 58100863601440803285986596899425752397880191<44> × 2204671532539725204437991248517631768420285351501781<52> |