Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 539: | \[{21^{539}-1\over20}\] | 43 × 631 × 3319 × 7057 × 6225803431<10> × 222327371113<12> × 1606344741163<13> × 1767442850839<13> × 17513875027111<14> × 1703751007820049542146461103<28> × 39824892937303186001525100993399811<35> × 82721492925050166710438512180782661<35> × [9662974984915184399881056991460785291433963675382527827661199390425479550356662573669484890527620116134793696873187739033480074793412951240403251690751619004098501659434129072797920624290052280155150642781717050805370829122548048681393956675873208864219629566575619393282575517057184307567017840263371298010725534440562097516635361577674045813232664860923010100090123271155328394664459036454151059014087973776530276503835429100221382487906885502200353572606334604878644002523636754765084406141213164421297139992603817382653911722795123840018577<544>] |