Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 291: | \[{8^{291}-1\over7}\] | 73 × 11447 × 132697 × 272959 × 9449353 × 2065304407 × 5434876633<10> × 7969524463<10> × 13842607235828485645766393<26> × 1170711644777651877659556633665719<34> × 21698965559461003965073675349879690425070563888163817782536115817713874113945263812490629925867658076950469188382253139569022738861697946929865939667767<152> |