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A057167
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Term in Recamán's sequence A005132 where n appears for first time, or 0 if n never appears.
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17
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1, 4, 2, 131, 129, 3, 5, 16, 14, 12, 10, 8, 6, 31, 29, 27, 25, 23, 99734, 7, 9, 11, 13, 15, 17, 64, 62, 60, 58, 56, 54, 52, 50, 48, 46, 44, 42, 40, 38, 111, 22, 20, 18, 28, 30, 32, 222, 220, 218, 216, 214, 212, 210, 208, 206, 204, 202, 200, 198, 196
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1642 (taking a(1355) from A064227)
Nick Hobson, Python program for this sequence
C. L. Mallows, Plot (jpeg) of first 10000 terms of A005132
C. L. Mallows, Plot (postscript) of first 10000 terms of A005132
N. J. A. Sloane, My favorite integer sequences, in Sequences and their Applications (Proceedings of SETA '98).
N. J. A. Sloane, FORTRAN program for A005132, A057167, A064227, A064228
Index entries for sequences related to Recamán's sequence
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MAPLE
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w := array(1..10000); for j from 1 to 100 do l := 0; for k from 1 to nops(a) do if a[k] = j then l := k; exit; fi; od: w[j] := l; od: s := [seq(w[j], j=1..100)]; # where a is an array formed from sequence A005132
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MATHEMATICA
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A005132 = {0}; Do[If[(r = Last[A005132] - n) <= 0 || MemberQ[ A005132, r], r = r + 2n]; AppendTo[ A005132, r], {n, 1, 10^5}]; a[n_] := If[p = Position[ A005132, n]; p == {}, 0, p[[1, 1]] - 1]; Table[a[n], {n, 1, 60}] (* Jean-François Alcover, Jul 18 2012 *)
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CROSSREFS
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Cf. A005132, A057165, A057166.
Cf. A187943, A187922.
Sequence in context: A236381 A201228 A010319 * A096683 A158903 A152030
Adjacent sequences: A057164 A057165 A057166 * A057168 A057169 A057170
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KEYWORD
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nonn,easy,nice,look
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AUTHOR
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N. J. A. Sloane, Sep 14 2000
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EXTENSIONS
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I conjecture a(n) is never 0 - but see A064227, A064228.
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STATUS
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approved
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