Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
317: | \[{3^{317}-1\over2}\] | 3493595928049<13> × 199057440042898163364095413<27> × 12710325224532361270546928237682575636745569160170389254100773596801505598003051745765802129086629199490093597013<113> |