Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 543: | \[2^{543}-1\] | 7 × 1087 × 43441 × 1164193 × 7648337 × 7923871097285295625344647665764672671<37> × 534955385319592511227419175872576025063351<42> × 2307880312514050317434773233753379487634082230810808744501836223<64> |