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A043993
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Numbers k such that 6 and 7 occur juxtaposed in the base-9 representation of k but not of k+1.
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0
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61, 69, 142, 150, 223, 231, 304, 312, 385, 393, 466, 474, 547, 557, 629, 636, 709, 717, 790, 798, 871, 879, 952, 960, 1033, 1041, 1114, 1122, 1195, 1203, 1276, 1286, 1358, 1365, 1438, 1446, 1519, 1527, 1600, 1608, 1681, 1689
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internal format)
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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], {6, 7}]>0||SequenceCount[ IntegerDigits[ n, 9], {7, 6}]>0, 1, 0], {n, 1700}], {1, 0}][[;; , 1]] (* Harvey P. Dale, Aug 13 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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