OFFSET
1,1
COMMENTS
LINKS
Rémy Sigrist, Table of n, a(n) for n = 1..10000
Rémy Sigrist, PARI program for A281120
EXAMPLE
Here is an illustration of the first terms:
n a(n) a(2n) gcd(a(n),a(2n))
-- ---- ----- ---------------
1 2 4 2
2 4 6 2
3 3 9 3
4 6 8 2
5 5 15 5
6 9 12 3
7 7 14 7
8 8 18 2
9 10 20 10
10 15 21 3
11 11 33 11
12 12 24 12
13 13 26 13
14 14 28 14
15 16 30 2
16 18 32 2
17 17 51 17
18 20 36 4
19 19 38 19
20 21 42 21
21 22 44 22
22 33 45 3
23 23 46 23
24 24 48 24
25 25 50 25
CROSSREFS
KEYWORD
nonn
AUTHOR
Rémy Sigrist, Jan 15 2017
STATUS
approved