Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 691: | \[2^{691}-1\] | 906642603313<12> × 10488160032325844521<20> × 2833637724427940664433391497<28> × 16636201944470267267182958207<29> × 22918862886543542550497013689794549380986252187467410793440853162884227395126178667668709323949107483968180609969160895841<122> |