Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 461: | \[2^{461}-1\] | 2767 × 358228856441770927<18> × 7099353734763245383<19> × 846134609236527432935428641453947808692744612842997575850108349114305165850593069285923876628410633<99> |