Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 436: | \[2^{436}-1\] | 3 × 5 × 5669 × 104124649 × 666184021 × 745988807 × 74323515777853<14> × 1746518852140345553<19> × 171857646012809566969<21> × 870035986098720987332873<24> × 2077756847362348863128179<25> |