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A044431
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Numbers n such that string 9,9 occurs in the base 10 representation of n but not of n-1.
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0
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99, 199, 299, 399, 499, 599, 699, 799, 899, 990, 1099, 1199, 1299, 1399, 1499, 1599, 1699, 1799, 1899, 1990, 2099, 2199, 2299, 2399, 2499, 2599, 2699, 2799, 2899, 2990, 3099, 3199, 3299, 3399, 3499, 3599, 3699, 3799, 3899
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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, 9}]>0, 1, 0], {n, 4000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 27 2019 *)
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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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