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 A067090 Floor(X/Y) where X = concatenation of (2n), (2n-1), ... down to n+1 and Y = concatenation of 1,2,3,... up to n. 9
 2, 3, 5, 7, 8, 981, 114462, 13082645, 1471900839, 1635537203, 1799173568, 1962809933, 2126446298, 2290082663, 2453719028, 2617355393, 2780991758, 2944628123, 3108264488, 3271900853, 3435537218, 3599173583, 3762809948 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS EXAMPLE a(4) = floor(8765/1234) = 7. a(6) = floor(121110987/123456) = floor(981.00527313374805598755832037325) = 981. MATHEMATICA f[n_] := (k = 1; x = y = "0"; While[k < n + 1, x = StringJoin[x, ToString[2n - k + 1]]; y = StringJoin[y, ToString[2k - 1]]; k++ ]; Return[ Floor[ ToExpression[x] / ToExpression[y]]] ); Table[ f[n], {n, 1, 25} ] Table[Floor[FromDigits[Flatten[IntegerDigits/@(Range[2n, n+1, -1])]]/FromDigits[Flatten[IntegerDigits/@(Range[n])]]], {n, 25}] (* Harvey P. Dale, Jul 24 2011 *) CROSSREFS Cf. A067088, A067089. Sequence in context: A105404 A238378 A075012 * A284173 A276227 A274698 Adjacent sequences:  A067087 A067088 A067089 * A067091 A067092 A067093 KEYWORD easy,base,nonn AUTHOR Amarnath Murthy, Jan 07 2002 EXTENSIONS More terms from Robert G. Wilson v, Jan 09 2002 Edited by N. J. A. Sloane at the suggestion of Andrew S. Plewe, May 14 2007 STATUS approved

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Last modified December 7 00:39 EST 2019. Contains 329815 sequences. (Running on oeis4.)