Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 451: | \[2^{451}-1\] | 23 × 89 × 13367 × 18041 × 216481 × 164511353 × 9718704501529<13> × 538939720215834697<18> × 63146810207339718162566404988206179064461273050603002917638397126970137660970487<80> |