673

Previous  ... Next

Number

$673$ (six hundred and seventy-three) is:

The $122$nd prime number

The $15$th Proth prime after $3$, $5$, $13$, $17$, $41$, $97$, $113$, $193$, $241$, $257$, $353$, $449$, $577$, $641$:

$673 = 21 \times 2^5 + 1$

The $41$st left-truncatable prime after $2$, $3$, $5$, $7$, $\ldots$, $443$, $467$, $523$, $547$, $613$, $617$, $643$, $647$, $653$

Also see

• Previous  ... Next: Proth Prime
• Previous  ... Next: Left-Truncatable Prime
• Previous  ... Next: Prime Number