Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
199: | \[{7^{199}-1\over6}\] | 3583 × 214661295139431885643832154153997<33> × 86539116653269014086961051020627012232284504261471<50> × 3742361194240057893199566966355314018920268076528360256893169784289227626965547117<82> |