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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 (list; graph; refs; listen; history; text; internal format)
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: A335257 A119512 A262058 * A334599 A013556 A093596

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

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Last modified June 23 13:59 EDT 2021. Contains 345402 sequences. (Running on oeis4.)