Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
611: | \[2^{611}-1\] | 1223 × 2351 × 4513 × 8191 × 13264529 × 1609655415875897360904371080437164611501156560743<49> × 3744736435870999956010796884744886554946884079838024011697262620272142353192253445173330785999599327809826959361039<115> |