Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 291: | \[{7^{291}-1\over6}\] | 3 × 19 × 389 × 971 × 4657 × 134002009 × 951340693 × 23363930803<11> × 588884936839088389773662393029<30> × 11089767531884977816638380462821<32> × 17222352999891656035251217320770460421529616882638178794739485897363407<71> × 4160924156784953821413999107825795646911807584554735726748631757909547764679<76> |