Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
613: | \[2^{613}-1\] | 44599476833089207<17> × 332817722770314187794325446534549089<36> × 2290082526100134480992198124951512750039139339635155094272008280546850886939008711730865851616722892614369047154769105713048457413017<133> |