Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 112: | \[{4^{112}-1\over3}\] | 5 × 17 × 29 × 43 × 113 × 127 × 257 × 449 × 2689 × 5153 × 65537 × 15790321 × 183076097 × 54410972897<11> × 358429848460993<15> |