5525
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Number
$5525$ (five thousand, five hundred and twenty-five) is:
- $5^2 \times 13 \times 17$
- The $3$rd square pyramorphic number after $1$, $55$:
- $5525 = \ds \sum_{k \mathop = 1}^{25} k^2 = \dfrac {25 \paren {25 + 1} \paren {2 \times 25 + 1} } 6$
- The $25$th square pyramidal number after $1$, $5$, $14$, $30$, $55$, $\ldots$, $1015$, $1240$, $1496$, $1785$, $2109$, $2470$, $2870$, $3311$, $3795$, $4324$, $4900$:
- $5525 = \ds \sum_{k \mathop = 1}^{25} k^2 = \dfrac {25 \paren {25 + 1} \paren {2 \times 25 + 1} } 6$