3741

Number
$3741$ (three thousand, seven hundred and forty-one) is:


 * $3 \times 27 \times 43$


 * The $86$th triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $3240$, $3321$, $3403$, $3486$, $3570$, $3655$:
 * $3741 = \ds \sum_{k \mathop = 1}^{86} k = \dfrac {86 \times \paren {86 + 1} } 2$


 * The $2$nd of the $6$th pair of triangular numbers whose sum and difference are also both triangular:
 * $2145 = T_{65}$, $3741 = T_{86}$, $3741 + 2145 = T_{108}$, $3741 - 2145 = T_{56}$