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A044422
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Numbers n such that string 9,0 occurs in the base 10 representation of n but not of n-1.
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0
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90, 190, 290, 390, 490, 590, 690, 790, 890, 900, 990, 1090, 1190, 1290, 1390, 1490, 1590, 1690, 1790, 1890, 1900, 1990, 2090, 2190, 2290, 2390, 2490, 2590, 2690, 2790, 2890, 2900, 2990, 3090, 3190, 3290, 3390, 3490, 3590
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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], {9, 0}]>0, 1, 0], {n, 4000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Dec 02 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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