A133579 - cp's OEIS frontend

A133579 a(0)=a(1)=1; for n > 1, a(n) = 3*a(n-1) if a(n-1) and n are coprime, otherwise a(n) = a(n-1)/gcd(a(n-1), n).

n	a(n)
0	1
1	1
2	3
3	1
4	3
5	9
6	3
7	9
8	27
9	3
10	9
11	27
12	9
13	27
14	81
15	27
16	81
17	243
18	27
19	81
20	243
21	81
22	243
23	729
24	243
25	729
26	2187
27	81
28	243
29	729
30	243
31	729
32	2187
33	729
34	2187
35	6561
36	729
37	2187
38	6561
39	2187
40	6561
41	19683
42	6561
43	19683
44	59049
45	6561
46	19683
47	59049
48	19683
49	59049
50	177147

[1, 1, 3, 1, 3, 9, 3, 9, 27, 3, 9, 27, 9, 27, 81, 27, 81, 243, 27, 81, 243, 81, 243, 729, 243, 729, 2187, 81, 243, 729, 243, 729, 2187, 729, 2187, 6561, 729, 2187, 6561, 2187, 6561, 19683, 6561, 19683, 59049, 6561, 19683, 59049, 19683, 59049, 177147]

cp's OEIS Frontend

A133579 a(0)=a(1)=1; for n > 1, a(n) = 3*a(n-1) if a(n-1) and n are coprime, otherwise a(n) = a(n-1)/gcd(a(n-1), n).

Table of values

List of values