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A044353
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Numbers n such that string 2,1 occurs in the base 10 representation of n but not of n-1.
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0
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21, 121, 210, 221, 321, 421, 521, 621, 721, 821, 921, 1021, 1121, 1210, 1221, 1321, 1421, 1521, 1621, 1721, 1821, 1921, 2021, 2100, 2210, 2221, 2321, 2421, 2521, 2621, 2721, 2821, 2921, 3021, 3121, 3210, 3221, 3321, 3421
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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], {2, 1}] && !MemberQ[Partition[IntegerDigits[#-1], 2, 1], {2, 1}]&] (* Harvey P. Dale, Sep 24 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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