Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 176: | \[{21^{176}-1\over20}\] | 24 × 112 × 13 × 17 × 23 × 89 × 353 × 661 × 6073 × 62897 × 97241 × 300673 × 10362529 × 313433209 × 715521049 × 17513875027111<14> × 29831330140869137<17> × 32775913825604401<17> × 1105893073846539560737<22> × 4718573764413203147069<22> × 5417893210329015131948953725882474363297451134897776377577729527032001321285285179073<85> |