Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 476: | \[{21^{476}-1\over20}\] | 22 × 11 × 13 × 172 × 29 × 43 × 239 × 631 × 3319 × 3697 × 11969 × 14281 × 44983 × 78541 × 3181109 × 81867661 × 300293033 × 68454248717<11> × 268748262443333<15> × 114089969144083169<18> × 1502097124754084594737<22> × 399981195234791390040813065378761<33> × 2799538602198455356994757392557147<34> × 228981930777446745490310485965805923037<39> × 186787604522002770491907571889720992429013<42> × 19822950076647947256661837016844167085154211713<47> × 456547149396215146316989552005017911648766803061935886988961<60> × 1047793542046228932239094186657681797677507847051755213152299<61> × [461122167872867233607428329530255614041432767208151410912116988323031193466956895441666113054086502289431121323438500710168100904120041580371538316195488919253062232264206278845976385966762261<192>] |