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A044168
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Numbers n such that string 4,2 occurs in the base 7 representation of n but not of n-1.
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0
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30, 79, 128, 177, 210, 226, 275, 324, 373, 422, 471, 520, 553, 569, 618, 667, 716, 765, 814, 863, 896, 912, 961, 1010, 1059, 1108, 1157, 1206, 1239, 1255, 1304, 1353, 1402, 1451, 1470, 1549, 1582, 1598, 1647, 1696, 1745, 1794
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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..42.
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MATHEMATICA
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SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {4, 2}]>0, 1, 0], {n, 2000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Aug 17 2019 *)
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CROSSREFS
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Sequence in context: A045560 A159219 A098998 * A044549 A353176 A155461
Adjacent sequences: A044165 A044166 A044167 * A044169 A044170 A044171
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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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