Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 156: | \[{18^{156}-1\over17}\] | 52 × 73 × 132 × 19 × 53 × 79 × 131 × 157 × 229 × 307 × 313 × 457 × 521 × 2081 × 21997 × 4020180841 × 5210864257<10> × 5601346141<10> × 7424759473<10> × 29759719289<11> × 15715445027621<14> × 581721119015050561<18> × 170258429679493134487<21> × 12060074821194002629696165393<29> × 1412364383703504438982118048251<31> |