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.

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

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: A119512 A350028 A262058 * A334599 A371203 A013556

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