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A039667 Numbers k that together with their double and triple contain every digit from 1-9 exactly once. 0
192, 219, 273, 327 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
REFERENCES
D. Wells, Curious and interesting numbers, Penguin Books, p. 128.
LINKS
EXAMPLE
k=327 -> 2k=654 -> 3k=981 and 327654981 is a 'nine-digit' number.
MATHEMATICA
pdnQ[n_]:=Sort[Flatten[IntegerDigits[{n, 2n, 3n}]]]==Range[9]; Select[Range[987], pdnQ] (* Harvey P. Dale, Jul 07 2012 *)
CROSSREFS
Cf. A050289.
Sequence in context: A206335 A289219 A190892 * A273890 A344860 A045077
KEYWORD
nonn,base,fini,full
AUTHOR
EXTENSIONS
Corrected by Patrick De Geest, Mar 15 2000
Better definition from Tanya Khovanova, Mar 08 2021
STATUS
approved

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Last modified May 18 08:45 EDT 2024. Contains 372618 sequences. (Running on oeis4.)