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A044724
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Numbers n such that string 1,1 occurs in the base 10 representation of n but not of n+1.
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0
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11, 119, 211, 311, 411, 511, 611, 711, 811, 911, 1011, 1199, 1211, 1311, 1411, 1511, 1611, 1711, 1811, 1911, 2011, 2119, 2211, 2311, 2411, 2511, 2611, 2711, 2811, 2911, 3011, 3119, 3211, 3311, 3411, 3511, 3611, 3711, 3811
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {1, 1}]>0, 1, 0], {n, 4000}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Apr 22 2018 *)
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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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