Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 669: | \[2^{669}-1\] | 7 × 18287 × 196687 × 1466449 × 2916841 × 1469495262398780123809<22> × 182224921317852297530287<24> × 596242599987116128415063<24> × 142453214851009124378099897532172312583433956914474541632456432848048989381236579920379218575796308080313112697<111> |