A064473 Where the odd terms appear in A064413 (if it begins at 2).

4, 5, 9, 10, 13, 14, 19, 20, 21, 23, 24, 27, 28, 32, 33, 36, 37, 38, 42, 43, 49, 50, 52, 53, 56, 57, 60, 61, 66, 67, 68, 73, 74, 75, 77, 80, 81, 83, 84, 88, 89, 92, 95, 96, 99, 100, 106, 107, 108, 110, 111, 114, 115, 117, 118, 123, 124, 127, 128

Offset

1,1

Links

Table of n, a(n) for n=1..59.

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] // Rest;
Position[EKG, _?OddQ] // Flatten (* Jean-François Alcover, Feb 07 2019, after Robert G. Wilson v in A064413 *)

Crossrefs

Cf. A064413. See A064957 for better version.

Sequence in context: A193259 A008935 A003995 * A287962 A001983 A143575

Adjacent sequences: A064470 A064471 A064472 * A064474 A064475 A064476

Keyword

nonn

Author

N. J. A. Sloane, Oct 05 2001

Status

approved