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A044344
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Numbers n such that string 1,2 occurs in the base 10 representation of n but not of n-1.
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0
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12, 112, 120, 212, 312, 412, 512, 612, 712, 812, 912, 1012, 1112, 1120, 1200, 1312, 1412, 1512, 1612, 1712, 1812, 1912, 2012, 2112, 2120, 2212, 2312, 2412, 2512, 2612, 2712, 2812, 2912, 3012, 3112, 3120, 3212, 3312, 3412
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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[3500], MemberQ[Partition[IntegerDigits[#], 2, 1], {1, 2}] && !MemberQ[ Partition[IntegerDigits[#-1], 2, 1], {1, 2}]&] (* Harvey P. Dale, Jul 13 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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