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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: 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

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Last modified August 3 19:29 EDT 2024. Contains 374909 sequences. (Running on oeis4.)