Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 78: | \[{13^{78}-1\over12}\] | 2 × 3 × 7 × 53 × 61 × 79 × 157 × 1093 × 4603 × 13417 × 20333 × 21841 × 79301 × 264031 × 1803647 × 57745124662681<14> × 584288727345658049575114801<27> |