Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 421: | \[{3^{421}-1\over2}\] | 1206587 × 6804488281<10> × 129208238531<12> × 30289645235740564742379791<26> × 4635694062476599636809044531<28> × 10722271475553804482227981559844589<35> × 231035209566171522774298861859828133801304288561900916374974326307295221185953743615097<87> |