Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
325: | \[2^{325}-1\] | 31 × 601 × 1801 × 7151 × 8191 × 51879585551<11> × 145295143558111<15> × 4613679391936953610429590532014122532260339739644049093601<58> |