Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
54: | \[{28^{54}-1\over27}\] | 33 × 192 × 29 × 37 × 109 × 127 × 163 × 271 × 541 × 757 × 102547 × 444979 × 2320484707 × 2714261904253<13> × 68948693997660959163751<23> |