4141

Number
$4141$ (four thousand, one hundred and forty-one) is:
 * $41 \times 101$


 * The $41$st heptagonal number after $1, 7, 18, 34, 55, 81, 112, \ldots, 3010, 3186, 3367, 3553, 3744, 3940$:
 * $4141 = \displaystyle \sum_{k \mathop = 1}^{41} \left({5 k - 4}\right) = \dfrac {41 \left({5 \times 41 - 3}\right)} 2$