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 A162437 a(1)=1, a(2)=2. Take terms a(n-1) and a(n-2), then convert to binary. Concatenate them, with either binary a(n-1) on the left and a(n-2) on the right, or with a(n-1) on the right and a(n-2) on the left such that the value of the resulting binary number is minimized. a(n) = the decimal equivalent of the resulting binary number. 1
 1, 2, 5, 21, 173, 5549, 1420717, 11638517165, 24407739551034797, 419321772563920711635545517, 15107659029337673520218077770654501397966253 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE The binary representation of the first few terms: 1, 10, 101, 10101, 10101101 MATHEMATICA a[1] = 1; a[2] = 2; a[n_] := Block[{a1 = IntegerDigits[ a[n - 1], 2], a2 = IntegerDigits[ a[n - 2], 2]}, Min[ FromDigits[ Join[a1, a2], 2], FromDigits[ Join[a2, a1], 2]]]; Array[a, 13] (* Robert G. Wilson v, Jul 27 2009 *) CROSSREFS Cf. A005203, A111061, A162438. Sequence in context: A176527 A117261 A108021 * A216756 A007570 A173313 Adjacent sequences:  A162434 A162435 A162436 * A162438 A162439 A162440 KEYWORD base,nonn AUTHOR Leroy Quet, Jul 03 2009 EXTENSIONS More terms from Robert G. Wilson v, Jul 27 2009 STATUS approved

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Last modified August 3 19:28 EDT 2020. Contains 336201 sequences. (Running on oeis4.)