Base 22 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 42: | \[{22^{42}-1\over21}\] | 3 × 7 × 132 × 23 × 29 × 43 × 463 × 3571 × 86969 × 404671 × 9299179 × 16968421 × 12271836836138419<17> |