Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 577: | \[2^{577}-1\] | 3463 × 132305774316967<15> × 1079633141772892852450713464662329764119217100464362618290526362027911012565069142996396993157133020422681868025602819574600599624729277860300320636162145551<157> |