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A064160 Numbers k such that the digits of k joined to the digits of 2k contain each of the digits from 1 to 9 once. 5
6729, 6792, 6927, 7269, 7293, 7329, 7692, 7923, 7932, 9267, 9273, 9327 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
REFERENCES
David Wells, The Penguin Dictionary of Curious and Interesting Numbers, p. 160 (Rev. ed. 1997).
LINKS
EXAMPLE
Twice 7269 equals 14538 and those two numbers comprise the digits from 1 to 9.
MATHEMATICA
Select[ Range[ 1000000 ], {1, 2, 3, 4, 5, 6, 7, 8, 9} == Sort[ Join[ IntegerDigits[ # ], IntegerDigits[ 2 # ] ] ] & ]
CROSSREFS
Sequence in context: A035905 A099778 A049507 * A249463 A031642 A257486
KEYWORD
base,fini,full,nonn
AUTHOR
Harvey P. Dale, Sep 15 2001
STATUS
approved

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Last modified March 5 08:03 EST 2024. Contains 370538 sequences. (Running on oeis4.)