Base 27 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
47: | \[{27^{47}-1\over26}\] | 1223 × 21997 × 5112661 × 96656723 × 161969595577<12> × 2031161085853<13> × 165301473942399079669<21> |