15,051

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Number

$15 \, 051$ (fifteen thousand and fifty-one) is:

$3 \times 29 \times 173$

The $13$th palindromic triangular number after $0$, $1$, $3$, $6$, $55$, $66$, $171$, $595$, $666$, $3003$, $5995$, $8778$

The $173$rd triangular number:

$15 \, 051 = \ds \sum_{k \mathop = 1}^{173} k = \dfrac {173 \times \paren {173 + 1} } 2$

Also see

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