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A064469 The even subsequence of A064413. 1
2, 4, 6, 12, 8, 10, 18, 14, 24, 16, 20, 22, 30, 28, 26, 36, 32, 34, 42, 38, 40, 44, 46, 48, 50, 52, 54, 56, 60, 70, 58, 66, 62, 72, 64, 68, 74, 78, 76, 80, 82, 84, 88, 86, 90, 100, 92, 94, 96, 98, 104, 102, 108, 106, 114, 110, 112, 116, 118, 120 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..60.

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

MATHEMATICA

ekg[s_] := Block[{m = s[[-1]], k = 3}, While[MemberQ[s, k] || GCD[m, k] == 1, k++]; Append[s, k]];

EKG = Nest[ekg, {1, 2}, 200];

Cases[EKG, _?EvenQ] (* Jean-Fran├žois Alcover, Feb 07 2019, after Robert G. Wilson v in A064413 *)

CROSSREFS

Sequence in context: A190071 A189498 A129567 * A057700 A236020 A234515

Adjacent sequences:  A064466 A064467 A064468 * A064470 A064471 A064472

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 05 2001

STATUS

approved

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Last modified November 20 10:09 EST 2019. Contains 329334 sequences. (Running on oeis4.)