Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 117: | \[{28^{117}-1\over27}\] | 32 × 192 × 53 × 271 × 1483 × 1951 × 444979 × 219386077 × 360548139979<12> × 4543753614603737<16> × 81923931656777716741<20> × 2441437589227959094240729<25> × 178135134528413184980284396604535851624652223234840956388261926510811<69> |