Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 488: | \[2^{488}-1\] | 3 × 5 × 17 × 733 × 977 × 1709 × 3456749 × 37831175201<11> × 368140581013<12> × 667055378149<12> × 768614336404564651<18> × 2305843009213693951<19> × 4889940029309876547089<22> × 9200725871078697500072796227876997617<37> |