OFFSET
1,2
COMMENTS
This sequence is a permutation of the natural numbers:
- beyond the sixth row, every even number gives rise to another even number,
- so eventually every even number appears in the sequence,
- for any odd prime number p we will have infinitely many multiples of 2*p,
- giving rise to infinitely many multiples of p,
- and eventually every number will appear.
LINKS
EXAMPLE
The first terms and rows are:
n a(n) row(n)
-- ---- ------------
1 1 [1]
2 2 [2]
3 3 [3]
4 4 [4]
5 5 [5]
6 6 [6, 9]
7 9 [12]
8 12 [8, 15]
9 8 [10]
10 15 [18, 20]
11 10 [14, 25]
PROG
(PARI) See Links section.
CROSSREFS
KEYWORD
AUTHOR
Rémy Sigrist, Jan 06 2020
STATUS
approved