OFFSET
1,1
COMMENTS
The EKG sequence A064413 has 3 critical lines.
Points which belong to the critical lines:
(3/2) 2*A064413(k) = 3*k see this sequence,
(1/2) 2*A064413(k) = k contains only 2 numbers: {10, 14}.
Only 12 and 16 in this sequence are not of the form 2*prime.
Because points are concentrated on the plot of EKG sequence near these 3 critical lines, the number of points belonging to critical lines is surprisingly low.
Conjecture: Number of points on 3 critical lines of EKG sequence is finite (and complete?). - Artur Jasinski, Dec 08 2008
a(9) > 10^5, if it exists. - Amiram Eldar, Oct 23 2024
CROSSREFS
KEYWORD
nonn,more,changed
AUTHOR
Artur Jasinski, Dec 06 2008
STATUS
approved