4010

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Number

$4010$ (four thousand and ten) is:

$2 \times 5 \times 401$

The magic constant of a magic square of order $20$, after $1$, $(5)$, $15$, $34$, $\ldots$, $870$, $1105$, $1379$, $1695$, $2056$, $2465$, $2925$, $3439$:

$\ds 4010 = \dfrac 1 {20} \sum_{k \mathop = 1}^{20^2} k = \dfrac {20 \paren {20^2 + 1} } 2$

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