Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 391: | \[{3^{391}-1\over2}\] | 47 × 1871 × 17987 × 34511 × 94214579 × 1001523179 × 2837442021361921<16> × 1136310624674027548741<22> × 1720132331768569247939<22> × 72643760507536226775553<23> × 947813454284697545292967550627029<33> × 911184764288845829298764189996262739860779<42> |