Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 549: | \[{20^{549}-1\over19}\] | 421 × 1831 × 38431 × 1575631 × 64008001 × 66277135621<11> × 74324733207911<14> × 3572703348960001<16> × 92217688652918971<17> × 5659784747821331230431654824725808002385097133154909051<55> × 353492674369674794757764552210659429026885470059796432698757021843303970099602513120554721932049833187172512456023830424336578624285934087981<141> × [9997340868222911427882807375604584991875832150823548796439300465674514100104288237576016755978804947284927807748340093371930808135554791592097327601800114091175028653340798111301745962649538077827297741173913893470792443494244307306326595315553503252264282714992116522434274238655194540810212480093309660856882266458088490112698662514970820857922312776666218002846454138880286784969904256796172062224258528270805648851979609712340398281<436>] |