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A001149
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A self-generating sequence: a(1)=1, a(2)=2, a(n+1) chosen so that a(n+1)-a(n-1) is the first number not obtainable as a(j)-a(i) for 1<=i<j<=n.
(Formerly M0689 N0254)
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4
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1, 2, 3, 5, 8, 13, 17, 26, 34, 45, 54, 67, 81, 97, 115, 132, 153, 171, 198, 228, 256, 288, 323, 357, 400, 439, 488, 530, 581, 627, 681, 732, 790, 843, 908, 963, 1029, 1085
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OFFSET
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1,2
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REFERENCES
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R. K. Guy, The second strong law of small numbers. Math. Mag. 63 (1990), no. 1, 3-20.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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Table of n, a(n) for n=1..38.
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CROSSREFS
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Cf. A054540.
Sequence in context: A121367 A221672 A070217 * A144117 A081612 A120761
Adjacent sequences: A001146 A001147 A001148 * A001150 A001151 A001152
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane.
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EXTENSIONS
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Description corrected and moved to name line by Franklin T. Adams-Watters, Nov 01 2009
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STATUS
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approved
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