Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 503: | \[2^{503}-1\] | 3213684984979279<16> × 12158987054135300783<20> × 1873030665061080894263<22> × 357801561527383951750371336247776228772287580084037416747290336593974702826921943012497755232377<96> |