Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
99: | \[{28^{99}-1\over27}\] | 32 × 192 × 199 × 271 × 262351 × 444979 × 6077039 × 50545507 × 4376814093829<13> × 425141076149786955572181811<27> × 588059502384167741754689230237055517031269700136285805215376626148451<69> |