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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 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.)