2542

Number
$2542$ (two thousand, five hundred and forty-two) is:
 * $2 \times 31 \times 41$


 * The $41$st second pentagonal number after $2$, $7$, $15$, $26$, $\ldots$, $1107$, $1190$, $1276$, $1365$, $1457$, $1552$, $1650$, $1751$, $1855$, $1962$, $2072$, $2185$, $2301$, $2420$:
 * $2542 = \dfrac {41 \left({3 \times 41 + 1}\right)} 2$


 * The $82$nd generalized pentagonal number after $1$, $2$, $5$, $7$, $12$, $15$, $\ldots$, $2072$, $2147$, $2185$, $2262$, $2301$, $2380$, $2420$, $2501$:
 * $2542 = \dfrac {41 \left({3 \times 41 + 1}\right)} 2$