Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 164: | \[{4^{164}-1\over3}\] | 5 × 17 × 83 × 10169 × 13121 × 13367 × 181549 × 12112549 × 43249589 × 164511353 × 8562191377<10> × 8831418697<10> × 12243864122465612155106392056552353<35> |