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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: 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

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Last modified December 5 17:42 EST 2019. Contains 329768 sequences. (Running on oeis4.)