Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 439: | \[2^{439}-1\] | 104110607 × 127321491658223<15> × 122551752733003055543<21> × 873880146833642190373525520936770796845382029997855219402285283144955696825577908510162169<90> |