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A043138
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Numbers n such that 1 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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10, 22, 59, 70, 108, 120, 154, 169, 206, 218, 255, 267, 304, 316, 353, 365, 402, 413, 451, 463, 490, 549, 561, 598, 610, 647, 659, 696, 708, 745, 756, 794, 806, 840, 855, 892, 904, 941, 953, 990, 1002, 1039, 1051, 1078, 1137
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refs;
listen;
history;
text;
internal format)
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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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Select[Range[1200], MemberQ[Sort/@Partition[IntegerDigits[#, 7], 2, 1], {1, 3}] && !MemberQ[Sort/@Partition[IntegerDigits[#-1, 7], 2, 1], {1, 3}]&] (* From Harvey P. Dale, Aug 10 2011 *)
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CROSSREFS
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Sequence in context: A039315 A225708 A088871 * A043918 A033459 A015902
Adjacent sequences: A043135 A043136 A043137 * A043139 A043140 A043141
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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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