Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 310: | \[{20^{310}-1\over19}\] | 3 × 7 × 11 × 61 × 251 × 311 × 11161 × 40487 × 70061 × 75269 × 152381 × 766321 × 1646101 × 2387311 × 102567841 × 340037881769<12> × 581740080393079<15> × 48309707746869061391<20> × 1087505315388920334551<22> × 335566676799518320433573040127<30> × 58100863601440803285986596899425752397880191<44> × 2204671532539725204437991248517631768420285351501781<52> × 19921053930451490092539645581715615119244663385625734162860113699971908703969149655755103618807182139269761978049512460002072159567833872081075277828361<152> |