Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 63: | 43 × 127 × 463 × 631 × 3319 × 4789 × 6427 × 51787 × 85775383 × 227633407 × 22125429901<11> × 27186384126763<14> × 100595851688887003<18> |