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 A163808 Write n in binary. Place a 0 right of every 1 without a 0 right of it. a(n) = the decimal value of the result. 2
 2, 2, 10, 4, 10, 10, 42, 8, 18, 10, 42, 20, 42, 42, 170, 16, 34, 18, 74, 20, 42, 42, 170, 40, 82, 42, 170, 84, 170, 170, 682, 32, 66, 34, 138, 36, 74, 74, 298, 40, 82, 42, 170, 84, 170, 170, 682, 80, 162, 82, 330, 84, 170, 170, 682, 168, 338, 170, 682, 340, 682, 682, 2730 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All terms are even. LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 EXAMPLE 13 in binary is 1101. The first and last 1 each do not have a 0 right of them. So place a 0 after the first 1 and after the last 1 so as to get 101010. a(13) is the decimal equivalent of 101010, which is 42. MATHEMATICA f[n_Integer]:=Module[{l=IntegerDigits[n, 2]//.{a___, 1, 1, b___}->{a, 1, 0, 1, b}}, If[Last[l]==1, l=Append[l, 0], l]; FromDigits[l, 2]]; Table[f[i], {i, 60}] [From Harvey P. Dale, Aug 13 2009] CROSSREFS Cf. A163809 Sequence in context: A308693 A163937 A083457 * A223126 A127058 A242002 Adjacent sequences:  A163805 A163806 A163807 * A163809 A163810 A163811 KEYWORD base,nonn AUTHOR Leroy Quet, Aug 04 2009 EXTENSIONS Additional terms provided. Harvey P. Dale, Aug 12 2009 More terms from Sean A. Irvine, Nov 05 2009 STATUS approved

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Last modified April 23 05:56 EDT 2021. Contains 343199 sequences. (Running on oeis4.)