Base 22 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 91: | \[{22^{91}-1\over21}\] | 7 × 79 × 2003 × 16968421 × 5617662779<10> × 85107437663<11> × 399038729570101851770821842995700631<36> × 1921581985509898771770887927247768403190704175924759<52> |