Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 290: | \[2^{290}-1\] | 3 × 11 × 31 × 59 × 233 × 1103 × 2089 × 3033169 × 7553921 × 999802854724715300883845411<27> × 2679895157783862814690027494144991<34> |