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A082215
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Concatenation of terms of A018238.
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2
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1, 121, 1213121, 121312141213121, 1213121412131215121312141213121, 121312141213121512131214121312161213121412131215121312141213121, 1213121412131215121312141213121612131214121312151213121412131217121312141213121512131214121312161213121412131215121312141213121
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refs;
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history;
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internal format)
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OFFSET
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1,2
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COMMENTS
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Also called Zimin words.
a(n) is a palindrome for n<10; it is debatable whether a(n) can be called a Zimin word for n>=10 (see the Comments in A018238). - Danny Rorabaugh, Sep 26 2015
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LINKS
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FORMULA
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The Zimin words are defined here by Z_1 = 1, Z_n = Z_{n-1}nZ_{n-1}. - Dmitry Kamenetsky, Sep 30 2006
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MATHEMATICA
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a = {1}; Do[w = IntegerDigits@ a[[n - 1]]; AppendTo[a, FromDigits@ Join[w, IntegerDigits@ n, w]], {n, 2, 7}]; a (* Michael De Vlieger, Sep 26 2015 *)
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CROSSREFS
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See A001511 for another representation of this sequence of digits.
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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"Palindromes" replaced with "Numbers" in sequence name by Danny Rorabaugh, Sep 26 2015
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STATUS
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approved
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