Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 497: | \[2^{497}-1\] | 127 × 6959 × 228479 × 48544121 × 212885833 × 254461617383<12> × 770557961761093801278718793937377574043943382342011514028393021874470913652376022233958616983382625535943227047<111> |