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A043142
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Numbers n such that 2 and 3 occur juxtaposed in the base 7 representation of n but not of n-1.
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0
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17, 23, 66, 72, 115, 119, 161, 170, 213, 219, 262, 268, 311, 317, 360, 366, 409, 415, 458, 462, 504, 513, 556, 562, 605, 611, 654, 660, 703, 709, 752, 758, 801, 805, 833, 899, 905, 948, 954, 997, 1003, 1046, 1052, 1095, 1101
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..45.
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MATHEMATICA
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SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {2, 3}]>0 || SequenceCount[IntegerDigits[n, 7], {3, 2}]>0, 1, 0], {n, 1200}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 26 2017 *)
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CROSSREFS
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Sequence in context: A152292 A214493 A039319 * A043922 A260179 A100473
Adjacent sequences: A043139 A043140 A043141 * A043143 A043144 A043145
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KEYWORD
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nonn,base
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AUTHOR
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Clark Kimberling
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STATUS
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approved
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