Base 22 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 55: | \[{22^{55}-1\over21}\] | 67 × 331 × 353 × 118361 × 245411 × 1176469537 × 12124596978055103279634838475418155930577319721<47> |