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A239139
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The sequence S = a(1), a(2), ... is defined by a(1)=1, if d,e,f are consecutive decimal digits then we do not have d <= e = f, and S is always extended with the smallest integer not yet present in S.
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18
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 11, 20, 13, 14, 15, 16, 17, 18, 19, 21, 23, 22, 30, 24, 25, 26, 27, 28, 29, 31, 32, 34, 33, 40, 35, 36, 37, 38, 39, 41, 42, 43, 45, 44, 50, 46, 47, 48, 49, 51, 52, 53, 54, 56, 55, 60, 57, 58, 59, 61, 62, 63, 64, 65, 67, 66
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OFFSET
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1,2
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COMMENTS
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Computed by Lars Blomberg.
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REFERENCES
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Eric Angelini, Posting to Sequence Fans Mailing List, Sep 28 2013
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LINKS
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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