Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 313: | \[2^{313}-1\] | 10960009 × 14787970697180273<17> × 3857194764289141165278097<25> × 26693012026551688286164949958620483258358551879<47> |