Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 264: | \[{4^{264}-1\over3}\] | 3 × 5 × 7 × 13 × 17 × 23 × 67 × 89 × 97 × 241 × 257 × 353 × 397 × 673 × 683 × 2113 × 7393 × 20857 × 229153 × 312709 × 599479 × 4327489 × 119782433 × 1761345169 × 2931542417 × 43872038849<11> × 98618273953<11> × 16875081675650881<17> × 86945388997210442828259494992321<32> |