A067088 Floor(X/Y) where X = concatenation of (n+1), (n+2), ...up to 2n and Y = concatenation of 1,2,3,4,... up to n.

2, 2, 3, 4, 54, 6391, 721719, 73719014, 819008271, 900826453, 982644636, 1064462818, 1146281001, 1228099183, 1309917366, 1391735548, 1473553731, 1555371913, 1637190096, 1719008278, 1800826461, 1882644643, 1964462826

Offset

1,1

Links

Table of n, a(n) for n=1..23.

Example

a(4) = floor(5678/1234) = floor(4.60129659643435980551053484602917) = 4; a(6) = floor(789101112/123456) = 6391.

Mathematica

f[n_] := (k = 1; x = y = "0"; While[k < n + 1, x = StringJoin[x, ToString[n + k]]; y = StringJoin[y, ToString[2k - 1]]; k++ ]; Return[ Floor[ ToExpression[x] / ToExpression[y]]] ); Table[ f[n], {n, 1, 24} ]

Crossrefs

Sequence in context: A361246 A270744 A093927 * A065519 A329792 A058256

Adjacent sequences: A067085 A067086 A067087 * A067089 A067090 A067091

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