2176

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Number

$2176$ (two thousand, one hundred and seventy-six) is:

$2^7 \times 17$

The $16$th pentagonal pyramidal number after $1$, $6$, $12$, $40$, $75$, $126$, $196$, $288$, $405$, $550$, $726$, $936$, $1183$, $1470$, $1800$:

$2176 = \ds \sum_{k \mathop = 1}^{16} \dfrac {k \paren {3 k - 1} } 2 = \dfrac {16^2 \paren {16 + 1} } 2$

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