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 A067089 Floor(X/Y) where X = concatenation of (2n), (2n-1), ... down to n+1 and Y = concatenation of n, n-1, n-2, ... down to 1. 9
 2, 2, 2, 2, 2, 185, 18461, 1842626, 183987603, 1837682236, 1999303871, 2000827643, 2000777468, 2000722020, 2000673854, 2000631711, 2000594530, 2000561482, 2000531914, 2000505305, 2000481231, 2000459347, 2000439367 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..23. EXAMPLE a(6) = floor(121110987/654321) = floor(185.094146451053840546153951959359) = 185. MATHEMATICA f[n_] := (k = 1; x = y = "0"; While[k < n + 1, x = StringJoin[x, ToString[2n - k + 1]]; y = StringJoin[ToString[2k - 1], y]; k++ ]; Return[ Floor[10* ToExpression[x] / ToExpression[y]]] ); Table[ f[n], {n, 1, 25} ] fd[st_, en_]:=FromDigits[Flatten[IntegerDigits/@Range[st, en, -1]]]; Table[ Floor[fd[2n, n+1]/fd[n, 1]], {n, 30}] (* Harvey P. Dale, Jul 04 2013 *) CROSSREFS Cf. A067088. Sequence in context: A057331 A334053 A270374 * A339027 A343121 A090872 Adjacent sequences: A067086 A067087 A067088 * A067090 A067091 A067092 KEYWORD easy,base,nonn AUTHOR Amarnath Murthy, Jan 07 2002 EXTENSIONS More terms from Robert G. Wilson v, Jan 09 2002 Offset corrected by Sean A. Irvine, Dec 02 2023 STATUS approved

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Last modified July 12 09:57 EDT 2024. Contains 374239 sequences. (Running on oeis4.)