Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
63: | \[{28^{63}-1\over27}\] | 32 × 192 × 113 × 271 × 1009 × 444979 × 4422461 × 223934956756993189<18> × 154154940307497300453157<24> × 80504606285644335564853693<26> |