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A064160
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The integer digits of n joined to the integer digits of 2n contain each of the digits from 1 to 9 once.
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5
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6729, 6792, 6927, 7269, 7293, 7329, 7692, 7923, 7932, 9267, 9273, 9327
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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REFERENCES
| David Wells, The Penguin Dictionary of Curious and Interesting Numbers, p. 160 (Rev. ed. 1997).
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EXAMPLE
| Twice 7269 equals 14538 and those two numbers comprise the digits from 1 to 9.
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MATHEMATICA
| Select[ Range[ 1000000 ], {1, 2, 3, 4, 5, 6, 7, 8, 9} == Sort[ Join[ IntegerDigits[ # ], IntegerDigits[ 2 # ] ] ] & ]
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CROSSREFS
| Sequence in context: A099778 A035905 A049507 * A204615 A204799 A151637
Adjacent sequences: A064157 A064158 A064159 * A064161 A064162 A064163
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KEYWORD
| base,fini,full,nonn
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AUTHOR
| Harvey P. Dale (hpd1(AT)nyu.edu), Sep 15 2001
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