

A067091


Floor[X/Y] where X = concatenation of the (n+1)st even number through the (2n)th even number and Y = concatenation of first n even numbers.


13



2, 2, 329, 4101, 4919, 5737, 6556, 7374, 8193, 9012, 9830, 10649, 11467, 12286, 13104, 13923, 14741, 15560, 16378, 17197, 18015, 18834, 19652, 20471, 212899, 22108437, 2292696195, 237454867452, 24564011532104, 2538253631893694
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..30.
Hans Havermann, First 1000 terms


EXAMPLE

a(4) = floor(10121416/2468) = floor(4101.05996758508914100486223662885) = 4101.
a(7) = floor(16182022242628/2468101214) = floor(6556.4662222268166673) = 6556.


MATHEMATICA

z[n_] := Block[{a = "", m = n}, While[ Length[m] > 0, a = StringJoin[a, ToString[m[[1]]]]; m = Drop[m, 1]]; ToExpression[a]]; Table[ Floor[ z[Table[2i, {i, n + 1, 2n}]] / z[ Table[2i, {i, 1, n}]]], {n, 1, 30}]


CROSSREFS

Cf. A067088, A067089, A067090.
Sequence in context: A068103 A119512 A262058 * A013556 A093596 A095304
Adjacent sequences: A067088 A067089 A067090 * A067092 A067093 A067094


KEYWORD

easy,base,nonn


AUTHOR

Amarnath Murthy, Jan 07 2002


EXTENSIONS

Edited by N. J. A. Sloane and Robert G. Wilson v, Jun 14 2002


STATUS

approved



