login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A064470 The even subsequence of A064413, divided by 2. 0
1, 2, 3, 6, 4, 5, 9, 7, 12, 8, 10, 11, 15, 14, 13, 18, 16, 17, 21, 19, 20, 22, 23, 24, 25, 26, 27, 28, 30, 35, 29, 33, 31, 36, 32, 34, 37, 39, 38, 40, 41, 42, 44, 43, 45, 50, 46, 47, 48, 49, 52, 51, 54, 53, 57, 55, 56, 58, 59, 60, 65, 61, 63, 70, 62, 64 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..66.

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

nmax = 120;

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}, nmax];

Select[EKG, EvenQ]/2 (* Jean-Fran├žois Alcover, Feb 13 2019, after Robert G. Wilson v in A064413 *)

CROSSREFS

Cf. A064413.

Sequence in context: A054076 A194873 A194901 * A194052 A178484 A222758

Adjacent sequences:  A064467 A064468 A064469 * A064471 A064472 A064473

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 05 2001

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 17 04:03 EDT 2019. Contains 327119 sequences. (Running on oeis4.)