Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 129: | \[{28^{129}-1\over27}\] | 3 × 271 × 1549 × 3613 × 56503 × 60029 × 684217 × 44447209 × 105942074311<12> × 23321405465263<14> × 17068111104046291434149<23> × 1709917733284391730017137<25> × 164657088579005200672613311<27> × 32061001271444759131207297109391925612749084897555244249<56> |