Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 406: | \[{4^{406}-1\over3}\] | 5 × 292 × 43 × 59 × 113 × 127 × 233 × 1103 × 2089 × 136417 × 3033169 × 107367629 × 121793911 × 536903681 × 596834617 × 3692022713 × 9810958633253<13> × 252715814615565962418688965855731<33> × 11348055580883272011090856053175361113<38> × 21597468549493958664902504331670645757<38> × 28474083676894571496726280348891354240661831606009<50> |