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0, 0, 1, 2, -2, 3, 5, 0, 1, -5, 4, 6, 1, -7, 6, 8, -1, 2, 3, -9, 12, 5, 7, 1, 10, 2, -1, -15, 10, 6, 1, 2, -16, 17, 7, 2, -18, 19, 6, 0, 3, 4, -20, 25, 3, 4, 5, 6, 7, -1, 12, 8, 2, 11, 15, 2, -28, 29, 7, 2, -30, 31, 9, 0, 3, 8, -30, 43, 6, 8, 5, 8, 9
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refs;
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OFFSET
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1,4
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COMMENTS
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Zeros appear at A152458.
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LINKS
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Peter Kagey, Table of n, a(n) for n = 1..10000
J. C. Lagarias, E. M. Rains and N. J. A. Sloane, The EKG sequence, arXiv:math/0204011 [math.NT], 2002.
J. C. Lagarias, E. M. Rains and N. J. A. Sloane, The EKG Sequence, Exper. Math. 11 (2002), 437-446.
Index entries for sequences related to EKG sequence
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MATHEMATICA
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terms = 100;
ekg[s_] := Block[{m = s[[-1]], k = 3}, While[MemberQ[s, k] || GCD[m, k] == 1, k++]; Append[s, k]];
Nest[ekg, {1, 2}, terms-2] - Range[terms] (* Jean-François Alcover, Sep 10 2018, after Robert G. Wilson v *)
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CROSSREFS
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Cf. A064413, A152458.
Sequence in context: A270744 A093927 A067088 * A329792 A058256 A140183
Adjacent sequences: A065516 A065517 A065518 * A065520 A065521 A065522
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KEYWORD
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sign
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AUTHOR
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N. J. A. Sloane, Nov 28 2001
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STATUS
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approved
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