Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 325: | \[{4^{325}-1\over3}\] | 11 × 31 × 131 × 251 × 601 × 1801 × 2731 × 3251 × 4051 × 7151 × 8191 × 409891 × 5840251 × 7623851 × 51879585551<11> × 7812610577851<13> × 145295143558111<15> × 9860942209386451<16> × 1245660907214169781926561543788801<34> × 4613679391936953610429590532014122532260339739644049093601<58> |