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A043219
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Numbers k such that 0 and 4 occur juxtaposed in the base-10 representation of k but not of k-1.
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0
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40, 104, 140, 204, 240, 304, 340, 400, 440, 504, 540, 604, 640, 704, 740, 804, 840, 904, 940, 1004, 1040, 1104, 1140, 1204, 1240, 1304, 1340, 1400, 1440, 1504, 1540, 1604, 1640, 1704, 1740, 1804, 1840, 1904, 1940, 2004, 2040
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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], {0, 4}]>0||SequenceCount[ IntegerDigits[ n], {4, 0}]>0, 1, 0], {n, 3000}], {0, 1}][[;; , 2]] (* Harvey P. Dale, Aug 16 2024 *)
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CROSSREFS
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KEYWORD
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nonn,base,changed
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AUTHOR
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STATUS
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approved
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