Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 203: | \[{4^{203}-1\over3}\] | 43 × 59 × 127 × 233 × 1103 × 2089 × 136417 × 3033169 × 121793911 × 596834617 × 3692022713 × 252715814615565962418688965855731<33> × 11348055580883272011090856053175361113<38> |