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

Author

Amarnath Murthy, Jan 07 2002

Keywords

• easy
• base
• nonn

Examples

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

Links

• Hans Havermann, First 1000 terms

Crossrefs

Cf. A067088, A067089, A067090.

Programs

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}]

Extensions

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