Base 22 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 71: | \[{22^{71}-1\over21}\] | 853 × 1333807 × 22769098493537073593<20> × 377053680512007141568376667202052487341211277952201406148840465729<66> |