3186

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Number

$3186$ (three thousand, one hundred and eighty-six) is:

$2 \times 3^3 \times 59$

The $36$th heptagonal number after $1$, $7$, $18$, $34$, $55$, $81$, $112$, $\ldots$, $2205$, $2356$, $2512$, $2673$, $2839$, $3010$:

$3186 = \ds \sum_{k \mathop = 1}^{36} \paren {5 k - 4} = \dfrac {36 \paren {5 \times 36 - 3} } 2$

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