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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
1,1
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
Sequence in context: A105404 A238378 A075012 * A284173 A276227 A355269
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
Offset corrected by Sean A. Irvine, Dec 02 2023
STATUS
approved

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Last modified July 25 00:10 EDT 2024. Contains 374585 sequences. (Running on oeis4.)