Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
77: | \[{28^{77}-1\over27}\] | 113 × 4422461 × 6077039 × 50545507 × 15215787226333<14> × 8043246179584357573185817<25> × 5320614889323243834845114570091316426473321807889<49> |