276

Number
$276$ (two hundred and seventy-six) is:


 * $2^2 \times 3 \times 23$


 * The $23$rd triangular number after $1, 3, 6, 10, 15, \ldots, 136, 153, 171, 190, 210, 231, 253$:
 * $276 = \displaystyle \sum_{k \mathop = 1}^{23} k = \dfrac {23 \times \left({23 + 1}\right)} 2$


 * The $12$th hexagonal number after $1, 6, 15, 28, 45, 66, 91, 120, 153, 190, 231$:
 * $276 = \displaystyle \sum_{k \mathop = 1}^{12} \left({4 k - 3}\right) = 12 \left({2 \times 12 - 1}\right)$


 * The $19$th untouchable number after $2$, $5$, $52$, $88$, $96$, $120$, $124$, $146$, $162$, $188$, $206$, $210$, $216$, $238$, $246$, $248$, $262$, $268$


 * The $14$th inconsummate number after $62$, $63$, $65$, $75$, $84$, $95$, $161$, $173$, $195$, $216$, $261$, $266$, $272$:
 * $\nexists n \in \Z_{>0}: n = 276 \times s_{10} \left({n}\right)$


 * The smallest positive integer which begins an aliquot sequence whose final status is unknown.

Also see

 * Aliquot Sequence starting from $276$