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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: A099778 A035905 A049507 * A249463 A031642 A257486 Adjacent sequences:  A064157 A064158 A064159 * A064161 A064162 A064163 KEYWORD base,fini,full,nonn AUTHOR Harvey P. Dale, Sep 15 2001 STATUS approved

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Last modified October 15 07:51 EDT 2019. Contains 328026 sequences. (Running on oeis4.)