

A067090


Floor(X/Y) where X = concatenation of (2n), (2n1), ... 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
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OFFSET

0,1


LINKS

Table of n, a(n) for n=0..22.


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



