Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 403: | \[2^{403}-1\] | 8191 × 45137 × 2147483647 × 8532838289<10> × 3049265608323207033354525040420863372400727272926604181336315082400000135598108701713853477087<94> |