Integer and its Double forming Pandigital Pair
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Theorem
$6729$ and its double contain all the digits from $1$ to $9$ between them.
Proof
$2 \times 6729 = 13 \, 458$
$\blacksquare$
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $6729$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $6729$