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A044757
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Numbers n such that string 4,4 occurs in the base 10 representation of n but not of n+1.
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0
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44, 144, 244, 344, 449, 544, 644, 744, 844, 944, 1044, 1144, 1244, 1344, 1449, 1544, 1644, 1744, 1844, 1944, 2044, 2144, 2244, 2344, 2449, 2544, 2644, 2744, 2844, 2944, 3044, 3144, 3244, 3344, 3449, 3544, 3644, 3744, 3844
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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], {4, 4}]>0, 1, 0], {n, 4000}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Dec 09 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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