Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 155: | \[{28^{155}-1\over27}\] | 311 × 5581 × 10789 × 637421 × 1675799 × 2564321 × 14307617 × 397274611 × 104175305182941687128096479<27> × 416524723519646267659397583333812081<36> × 192862818423813730952021099305030832126612640341<48> × 3095598401186987200227892960677796797777417549162703461189200777850001<70> |