OFFSET
1,2
COMMENTS
This sequence is a permutation of the natural numbers.
LINKS
EXAMPLE
The first terms, alongside the corresponding common ratios, are:
n a(3*n-2) a(3*n-1) a(3*n) r
-- -------- -------- ------ ---
1 1 2 4 2
2 3 6 12 2
3 5 10 20 2
4 7 14 28 2
5 8 16 32 2
6 9 15 25 5/3
7 11 22 44 2
8 13 26 52 2
9 17 34 68 2
10 18 30 50 5/3
11 19 38 76 2
12 21 42 84 2
13 23 46 92 2
14 24 36 54 3/2
15 27 45 75 5/3
PROG
(PARI) See Links section.
CROSSREFS
KEYWORD
AUTHOR
Rémy Sigrist, Apr 26 2020
STATUS
approved