Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 177: | \[{19^{177}-1\over18}\] | 3 × 127 × 709 × 68259547636548023031061<23> × 155306613932666028670208812450645212905178047040045530562317564121001023821<75> × 423828635266458170845334964596762841994559358561349897889452625659562004827564104195508550145596771286510464710632595426209<123> |