4141

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Number

$4141$ (four thousand, one hundred and forty-one) is:

$41 \times 101$

The $41$st heptagonal number after $1$, $7$, $18$, $34$, $55$, $81$, $112$, $\ldots$, $3010$, $3186$, $3367$, $3744$, $3940$:

$4141 = \ds \sum_{k \mathop = 1}^{41} \paren {5 k - 4} = \dfrac {41 \paren {5 \times 41 - 3} } 2$

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