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A044401
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Numbers n such that string 6,9 occurs in the base 10 representation of n but not of n-1.
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0
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69, 169, 269, 369, 469, 569, 669, 690, 769, 869, 969, 1069, 1169, 1269, 1369, 1469, 1569, 1669, 1690, 1769, 1869, 1969, 2069, 2169, 2269, 2369, 2469, 2569, 2669, 2690, 2769, 2869, 2969, 3069, 3169, 3269, 3369, 3469, 3569
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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[4000], MemberQ[Partition[IntegerDigits[#], 2, 1], {6, 9}] && !MemberQ[Partition[IntegerDigits[#-1], 2, 1], {6, 9}]&] (* Harvey P. Dale, Jul 20 2011 *)
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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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