Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 168: | \[{21^{168}-1\over20}\] | 23 × 11 × 13 × 17 × 29 × 43 × 61 × 73 × 337 × 421 × 463 × 617 × 631 × 3181 × 3319 × 3697 × 4789 × 6427 × 18481 × 97241 × 912521 × 7658113 × 81867661 × 227633407 × 518118697 × 68454248717<11> × 115593326297<12> × 266902182961<12> × 831380909129<12> × 22864311556633<14> × 2934413293238858072198024161<28> × 1432367584775648032290819051792496005705116017<46> |