9976
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Number
$9976$ (nine thousand, nine hundred and seventy-six) is:
- $2^3 \times 29 \times 43$
- The $58$th octagonal number, after $1$, $8$, $21$, $40$, $65$, $\ldots$, $7701$, $8008$, $8321$, $8640$, $8965$, $9296$, $9633$:
- $9976 = \ds \sum_{k \mathop = 1}^{58} \paren {6 k - 5} = 58 \paren {3 \times 58 - 2}$
Also see
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