Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 229: | \[{4^{229}-1\over3}\] | 1504073 × 18754643 × 20492753 × 59833457464970183<17> × 467795120187583723534280000348743236593<39> × 15333417141003794339164342447265426158851946182451963484372297<62> |