Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 665: | \[{4^{665}-1\over3}\] | 11 × 31 × 43 × 71 × 127 × 191 × 281 × 2281 × 4523 × 86171 × 122921 × 174763 × 524287 × 420778751 × 30327152671<11> × 161517058694951<15> × 3011347479614249131<19> × 106788290443848295284382097033<30> × 163537220852725398851434325720959<33> × 7482637214297894380845818269728205334531<40> × 1026967521054616466578103779542754304364711636498634914399431297119198516232792407493265881<91> × 132000131451539267726138633753205343827589683243629650599609859372129401308611030157603578434763278074238873853103561<117> |