Base 6 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 256: | \[{6^{256}-1\over5}\] | 7 × 17 × 37 × 257 × 353 × 1297 × 1697 × 2753 × 98801 × 145601 × 763649 × 4709377 × 50307329 × 3191106049 × 4926056449<10> × 19854979505843329<17> × 447183309836853377<18> × 2339340566463317436161<22> × 28753787197056661026689<23> × 2983028405608735541756929<25> × 18247770097021321924017185281<29> |