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A044170
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Numbers n such that string 4,4 occurs in the base 7 representation of n but not of n-1.
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0
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32, 81, 130, 179, 224, 277, 326, 375, 424, 473, 522, 567, 620, 669, 718, 767, 816, 865, 910, 963, 1012, 1061, 1110, 1159, 1208, 1253, 1306, 1355, 1404, 1453, 1502, 1551, 1568, 1649, 1698, 1747, 1796, 1845, 1894, 1939, 1992
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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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MATHEMATICA
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Select[Range[2000], MemberQ[Partition[IntegerDigits[#, 7], 2, 1], {4, 4}] && !MemberQ[Partition[IntegerDigits[#-1, 7], 2, 1], {4, 4}]&] (* Harvey P. Dale, Jan 17 2014 *)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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