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A065519 a(n) = A064413(n)-n. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
COMMENTS
Zeros appear at A152458.
LINKS
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.
MATHEMATICA
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 *)
CROSSREFS
Sequence in context: A270744 A093927 A067088 * A329792 A058256 A140183
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Nov 28 2001
STATUS
approved

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Last modified March 29 04:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)