Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 147: | \[{28^{147}-1\over27}\] | 3 × 113 × 197 × 271 × 1090153 × 2155609 × 4422461 × 319343666713<12> × 223934956756993189<18> × 991322283651723729605072437657<30> × 16651838915665484336259585989031118393<38> × 44498235948084746667439513476081194102813<41> × 2023532149466799320418430885960268664095518986313<49> |