Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 519: | \[2^{519}-1\] | 7 × 1039 × 730753 × 1505447 × 70084436712553223<17> × 155285743288572277679887<24> × 19709014643115560219397264671577125505264032974428376489237001990435774189483906244488746953221813209<101> |