Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 667: | \[2^{667}-1\] | 47 × 233 × 1103 × 2089 × 12007 × 178481 × 458897 × 88039999 × 246270735864387271375789289856617<33> × 14508653262991734676225669411020750337<38> × 78447248939510403238597103326670023020474096781883788452949188981488120758193300064923212988804239<98> |