903

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Number

$903$ (nine hundred and three) is:

$3 \times 7 \times 43$

The $42$nd triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $325$, $351$, $378$, $406$, $435$, $465$, $496$, $528$, $561$, $595$, $630$, $666$, $703$, $741$, $780$, $820$, $861$:

$903 = \ds \sum_{k \mathop = 1}^{42} k = \dfrac {42 \times \paren {42 + 1} } 2$

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