Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
50: | \[{28^{50}-1\over27}\] | 11 × 29 × 151 × 15101 × 53951 × 106801 × 637421 × 2606251 × 6813064001<10> × 7984305701<10> × 222929435014083414901<21> |