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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
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
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.)