Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 133: | \[{28^{133}-1\over27}\] | 113 × 2913233 × 4422461 × 21084187 × 268442413 × 530795452578128557<18> × 5504044949138999959<19> × 4561624887977679848933162147577525605222422443335850057720652079444297664198848221051207376735096470015885732291219068991373<124> |