805

Number
$805$ (eight hundred and five) is:


 * $5 \times 7 \times 23$


 * The $23$rd second pentagonal number after $2$, $7$, $15$, $26$, $\ldots$, $222$, $260$, $301$, $345$, $392$, $442$, $495$, $551$, $610$, $672$, $737$:
 * $805 = \dfrac {23 \paren {3 \times 23 + 1} } 2$


 * The $46$th generalized pentagonal number after $1$, $2$, $5$, $7$, $12$, $15$, $\ldots$, $392$, $425$, $442$, $477$, $495$, $532$, $551$, $590$, $610$, $651$, $672$, $715$, $737$, $782$:
 * $805 = \dfrac {23 \paren {3 \times 23 + 1} } 2$