Base 9 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 121: | \[{9^{121}-1\over8}\] | 23 × 67 × 661 × 727 × 2179 × 3851 × 11617 × 74779 × 3981923614021<13> × 657890411545272648205502849240259841<36> × 256900099994436377787031292704214632407889<42> |