Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 162: | \[{21^{162}-1\over20}\] | 2 × 11 × 19 × 37 × 109 × 163 × 199 × 421 × 463 × 613 × 1783 × 5077 × 17497 × 110323 × 4779433 × 85775383 × 7429452749713<13> × 7101932659132249<16> × 1276510846672627851615095313889284277672664124131976230679615049<64> × 251097226443098886970664441840231990201201851332912023687544574398706423<72> |