Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 506: | \[{31^{506}-1\over30}\] | 25 × 232 × 47 × 397 × 617 × 757241 × 1509997 × 36364703 × 61562537 × 82982989 × 150332843 × 1048563011 × 1975800971 × 45414448613<11> × 7176374761323733117<19> × 20236060635541385933<20> × 293006379555093281221<21> × 93982443075414692613761<23> × [6826344876082915443787152022200100474073357129063561460993784655036231850770561637508592791374311691582351808848747864797175773541194919497626773819387345038747685785193850838484604646809358542768939461551510678748762525159888360447434835764434131792409050579176836639831997449509140677<286>] × [88754841985769660750940553892365531913687686183235955289241494103364753037618664024229296957128957891931801742667061309096519827472462511579712818165928948937510679627049891060471155886610801058184395157766709904980717783624806441480454684909929343417583549915864952109563236026181272654592450724239991<302>] |