Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 611: | \[{4^{611}-1\over3}\] | 283 × 1223 × 2351 × 2731 × 4513 × 8191 × 13264529 × 165768537521<12> × 821546524439369<15> × 36753316833775394448156716611<29> × 1609655415875897360904371080437164611501156560743<49> × 38954799470098707550322754822902552371643630493051193<53> × 18797763449017866397156606883029501531283255813059467117896415330479873<71> × 3744736435870999956010796884744886554946884079838024011697262620272142353192253445173330785999599327809826959361039<115> |