Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 473: | \[2^{473}-1\] | 23 × 89 × 431 × 9719 × 2099863 × 12853303 × 133139883512681<15> × 4193551379485561391<19> × 1703616691469833244854254847<28> × 110790754439643451011977643288649104711084253377796092209089<60> |