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A179956
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a(n) is the smallest integer that contains a(n-1) but does not begin with a(n-1).
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0
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1, 21, 121, 1121, 11121, 111121, 1111121, 11111121, 111111121, 1111111121, 11111111121, 111111111121, 1111111111121, 11111111111121, 111111111111121, 1111111111111121, 11111111111111121, 111111111111111121, 1111111111111111121, 11111111111111111121
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OFFSET
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1,2
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LINKS
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FORMULA
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For n > 2, a(n) = 10^(n-1) + a(n-1). - Jon Maiga, Aug 04 2019
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EXAMPLE
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The next term after 1 is 21, because 21 is the lowest integer higher than 1 that contains a 1 but does not start with 1.
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MATHEMATICA
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a[1] = 1
a[2] = 21
a[n_] := 10^(n - 1) + a[n - 1]
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CROSSREFS
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KEYWORD
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easy,base,nonn
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AUTHOR
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EXTENSIONS
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Definition corrected and more terms added by Jon Maiga, Aug 04 2019
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STATUS
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approved
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