742
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Number
$742$ (seven hundred and forty-two) is:
- $2 \times 7 \times 53$
- The $8$th Keith number after $14$, $19$, $28$, $47$, $61$, $75$, $197$:
- $7$, $4$, $2$, $13$, $19$, $34$, $66$, $119$, $219$, $404$, $742$, $\ldots$
- The $34$th number whose divisor sum is square:
- $\map {\sigma_1} {742} = 1296 = 36^2$
Arithmetic Functions on $742$
\(\ds \map {\sigma_1} { 742 }\) | \(=\) | \(\ds 1296\) | $\sigma_1$ of $742$ |