4558

From ProofWiki
Jump to navigation Jump to search

Previous  ... Next

Number

$4558$ (four thousand, five hundred and fifty-eight) is:

$2 \times 43 \times 53$


The $43$rd heptagonal number after $1$, $7$, $18$, $34$, $55$, $81$, $112$, $\ldots$, $3010$, $3186$, $3367$, $3744$, $3940$, $4141$, $4347$:
$4558 = \ds \sum_{k \mathop = 1}^{43} \paren {5 k - 4} = \dfrac {43 \paren {5 \times 43 - 3} } 2$


Also see