|
|
|
|
1, 2, 2, 3, 6, 2, 5, 10, 6, 3, 7, 14, 2, 11, 22, 6, 15, 10, 6, 21, 14, 26, 13, 17, 34, 30, 15, 19, 38, 2, 23, 46, 6, 3, 5, 35, 42, 6, 29, 58, 10, 55, 33, 39, 26, 22, 77, 7, 31, 62, 10, 65, 78, 6, 37, 74, 14, 21, 51, 34, 30, 15, 41, 82, 2, 43, 86
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
By definition, all terms are squarefree (see A007947); repeated terms here are the squarefree kernels of A280864(n).
All even squarefree numbers appear infinitely often.
1 appears only at a(1).
Even terms appear consecutively in pairs, each pair followed by one or more odd terms.
Conjecture: all odd squarefree numbers > 1 appear infinitely often. If so, then A280864 is a permutation of the natural numbers.
|
|
LINKS
|
|
|
EXAMPLE
|
a(61) = 30 because A280864(61) = 60, and rad(60) = 30.
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|