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 A082215 Numbers obtained in the concatenation of terms starting with the first term of A018238. 2
 1, 121, 1213121, 121312141213121, 1213121412131215121312141213121, 121312141213121512131214121312161213121412131215121312141213121, 1213121412131215121312141213121612131214121312151213121412131217121312141213121512131214121312161213121412131215121312141213121 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 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 LINKS J. Cooper and D. Rorabaugh, Bounds on Zimin Word Avoidance, arXiv:1409.3080 [math.CO]; Congressus Numerantium, 222 (2014), 87-95. L. J. Cummings and M. Mays, A one-sided Zimin construction, Electron. J. Combin. 8 (2001), #R27. A. I. Zimin, Blocking sets of terms, Math. USSR Sbornik, 47 (1984), No. 2, 353-364. FORMULA The Zimin words are defined here by Z_1 = 1, Z_n = Z_{n-1}nZ_{n-1}. - Dmitry Kamenetsky, Sep 30 2006 MATHEMATICA 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 *) CROSSREFS Cf. A018238, A123121. See A001511 for another representation of this sequence of digits. Sequence in context: A317956 A136094 A317197 * A123179 A245593 A053885 Adjacent sequences:  A082212 A082213 A082214 * A082216 A082217 A082218 KEYWORD base,nonn AUTHOR Amarnath Murthy, Apr 08 2003 EXTENSIONS More terms from Joshua Zucker, May 08 2006 "Palindromes" replaced with "Numbers" in sequence name by Danny Rorabaugh, Sep 26 2015 STATUS approved

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Last modified May 19 20:41 EDT 2019. Contains 323410 sequences. (Running on oeis4.)