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A169857 Consider the EKG sequence (A064413) started at n instead of 2; a(n) = number of steps before sequence merges with A064413, or 0 if the two sequences never merge. 5

%I #11 May 16 2019 01:32:32

%S 0,44,3,44,44,44,8,44,44,48,44,44,44,18,17,58,18,51,18,44,48,62,48,44,

%T 47,44,48,82,48,90,31,48,65,44,48,101,71,47,48,116,48,129,41,39,87,

%U 135,48,65,46,65,47,148,48,104,58,71,105,168,104,187,121,69,64,69

%N Consider the EKG sequence (A064413) started at n instead of 2; a(n) = number of steps before sequence merges with A064413, or 0 if the two sequences never merge.

%C For the purpose of this sequence, ignore the initial 1 in A064413 and imagine that it begins with the 2.

%C The upper points appear to occur at primes, the points just below the upper points at twice primes.

%C Are there any zeros?

%H T. D. Noe, <a href="/A169857/b169857.txt">Table of n, a(n) for n=2..3000</a>

%H Gordon Hamilton, <a href="http://www.youtube.com/watch?v=yd2jr30K2R4">The EKG Sequence and the Tree of Numbers</a>

%H Gordon Hamilton, <a href="http://m.youtube.com/watch?v=Y2KhEW9CSOA">Untitled video related to previous video</a>

%Y Cf. A064413, A064421, A169837-A169856, A119415.

%K nonn

%O 2,2

%A _T. D. Noe_ and _N. J. A. Sloane_, Jun 02 2010

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Last modified March 29 06:15 EDT 2024. Contains 371265 sequences. (Running on oeis4.)