Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 545: | \[2^{545}-1\] | 31 × 3271 × 213641 × 745988807 × 18109412991311<14> × 2511696210834096991<19> × 870035986098720987332873<24> × 7647513170903349335637401<25> × 23548299583428753078153276336578257655370097978102396602253308281<65> |