Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 115: | \[{28^{115}-1\over27}\] | 47 × 567871 × 637421 × 322158931 × 1517655145813456319033978812579<31> × 1344840641680376608506117263739531145118237262742589311<55> × 87724686473407045984586880506193799815093321469457009158951<59> |