Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 529: | \[2^{529}-1\] | 47 × 178481 × 54999142147740840245669969<26> × 347916608026315949237260151<27> × 9114901722266383629807574332217258944092868367<46> × 1201143211548122610156499073546827568174014812959988601<55> |