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.

0, 44, 3, 44, 44, 44, 8, 44, 44, 48, 44, 44, 44, 18, 17, 58, 18, 51, 18, 44, 48, 62, 48, 44, 47, 44, 48, 82, 48, 90, 31, 48, 65, 44, 48, 101, 71, 47, 48, 116, 48, 129, 41, 39, 87, 135, 48, 65, 46, 65, 47, 148, 48, 104, 58, 71, 105, 168, 104, 187, 121, 69, 64, 69

Offset

2,2

Comments

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

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

Are there any zeros?

Links

T. D. Noe, Table of n, a(n) for n=2..3000

Gordon Hamilton, The EKG Sequence and the Tree of Numbers

Gordon Hamilton, Untitled video related to previous video

Crossrefs

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

Sequence in context: A174730 A037939 A040010 * A371554 A160330 A074175

Adjacent sequences: A169854 A169855 A169856 * A169858 A169859 A169860

Keyword

nonn

Author

T. D. Noe and N. J. A. Sloane, Jun 02 2010

Status

approved