Base 9 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 87: | \[{9^{87}-1\over8}\] | 7 × 13 × 59 × 349 × 523 × 6091 × 28537 × 74821 × 142159 × 261697 × 1383301 × 5385997 × 20381027 × 32234893 × 37464463 × 150224123975857<15> |