Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 323: | \[{21^{323}-1\over20}\] | 647 × 35531 × 95898701 × 12061389013<11> × 54921106624003<14> × 1502097124754084594737<22> × 272046503541850654234010302146342345570640171090338173567746947293309147746183077692257432088823368287678545480437736812954227805580683431052236592792803195729909281010447401138255409097659927294935493904570578876591559013240332128411729634496024248849424479180897548475709226328865354262488980951701630329509387504198734899729023181736374880518416915629785505220633<366> |