Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 220: | \[{8^{220}-1\over7}\] | 32 × 52 × 112 × 13 × 23 × 31 × 41 × 61 × 67 × 89 × 151 × 331 × 397 × 661 × 683 × 881 × 1321 × 2113 × 2971 × 3191 × 3301 × 8581 × 20857 × 201961 × 312709 × 599479 × 4327489 × 48912491 × 415365721 × 391249826881<12> × 415878438361<12> × 3630105520141<13> × 12127627350301<14> × 13379250952981<14> × 2252127523412251<16> × 2048568835297380486760231<25> |