Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
60: | \[{28^{60}-1\over27}\] | 3 × 52 × 11 × 13 × 29 × 31 × 61 × 157 × 271 × 757 × 1861 × 4621 × 14561 × 15991 × 45541 × 47221 × 53951 × 84961 × 637421 × 734941 × 2449561 × 84673681 × 688406401 |