Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 112: | \[{21^{112}-1\over20}\] | 24 × 11 × 13 × 17 × 29 × 43 × 113 × 617 × 631 × 3319 × 3697 × 12097 × 62897 × 97241 × 300673 × 912521 × 81867661 × 68454248717<11> × 115593326297<12> × 831380909129<12> × 31548272195219921<17> × 67888223448153422105362819002556545290401<41> |