Integer and its Double forming Pandigital Pair

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): $6729$
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