Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
121: | \[{28^{121}-1\over27}\] | 11617 × 70423 × 6077039 × 50545507 × 2510904286447886473<19> × 334379886633189962093<21> × 6046830224300802402489629<25> × 370660969097934421878960944564508608719653458904805255649830292044503755466433903783847<87> |