| Conjecture: This sequence is finite.
Contribution from Artur Jasinski (grafix(AT)csl.pl), Dec 08 2008: (Start)
The EKG sequence A064413 has 3 critical lines.
Numbers which belonging to the critical lines:
(1) A064413(n)=n see A152458,
(3/2) 2*A064413(n)=3n see A152519,
(1/2) 2*A064413(n)=n has only 2 numbers {10, 14}.
Because points are concentrated on the plot of EKG sequence near these 3
critical lines, the number of points belonging to critical lines is suprisingly low.
Is this sequence complete? (End)
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