Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
88: | \[{28^{88}-1\over27}\] | 5 × 232 × 29 × 89 × 157 × 27017 × 135433 × 614657 × 6077039 × 50545507 × 540610746853<12> × 23946685543873549601<20> × 59716358541760548549065761<26> × 1448228946058179249880169408969<31> |