|
|
A342766
|
|
a(1) = 1, for any n > 1, a(n) = A342765(a(n-1), n).
|
|
2
|
|
|
1, 2, 3, 6, 10, 10, 14, 28, 42, 42, 66, 66, 78, 78, 78, 156, 204, 204, 228, 228, 228, 228, 276, 276, 460, 460, 690, 690, 870, 870, 930, 1860, 1860, 1860, 1860, 1860, 2220, 2220, 2220, 2220, 2460, 2460, 2580, 2580, 2580, 2580, 2820, 2820, 3948, 3948, 3948, 3948
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
This sequence has similarities with A087052.
This sequence is nondecreasing.
A new value is introduced at each power of prime (A000961).
The ordinal transform of the sequence is A276781.
The RUNS transform of the sequence is A057820.
|
|
LINKS
|
|
|
EXAMPLE
|
The first terms, alongside their prime factorizations, are:
n a(n) n a(n)
-- ---- --------- ----------
1 1 1 1
2 2 2 2
3 3 3 3
4 6 2 * 2 2 * 3
5 10 5 2 * 5
6 10 2 * 3 2 * 5
7 14 7 2 * 7
8 28 2 * 2 * 2 2 * 2 * 7
9 42 3 * 3 2 * 3 * 7
10 42 2 * 5 2 * 3 * 7
11 66 11 2 * 3 * 11
12 66 2 * 2 * 3 2 * 3 * 11
|
|
PROG
|
(PARI) See Links section.
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|