A115070 - cp's OEIS frontend

A115070 a(n) = phi(n)/3^b(n), where b(n) is #{primes p=1 mod 3 dividing n}.

n	a(n)
1	1
2	1
3	2
4	2
5	4
6	2
7	2
8	4
9	6
10	4
11	10
12	4
13	4
14	2
15	8
16	8
17	16
18	6
19	6
20	8
21	4
22	10
23	22
24	8
25	20
26	4
27	18
28	4
29	28
30	8
31	10
32	16
33	20
34	16
35	8
36	12
37	12
38	6
39	8
40	16
41	40
42	4
43	14
44	20
45	24
46	22
47	46
48	16
49	14
50	20
51	32
52	8
53	52
54	18
55	40
56	8
57	12
58	28
59	58
60	16
61	20
62	10
63	12
64	32
65	16
66	20
67	22
68	32
69	44
70	8
71	70
72	24
73	24
74	12
75	40
76	12
77	20
78	8
79	26
80	32
81	54

[1, 1, 2, 2, 4, 2, 2, 4, 6, 4, 10, 4, 4, 2, 8, 8, 16, 6, 6, 8, 4, 10, 22, 8, 20, 4, 18, 4, 28, 8, 10, 16, 20, 16, 8, 12, 12, 6, 8, 16, 40, 4, 14, 20, 24, 22, 46, 16, 14, 20, 32, 8, 52, 18, 40, 8, 12, 28, 58, 16, 20, 10, 12, 32, 16, 20, 22, 32, 44, 8, 70, 24, 24, 12, 40, 12, 20, 8, 26, 32, 54]

cp's OEIS Frontend

A115070 a(n) = phi(n)/3^b(n), where b(n) is #{primes p=1 mod 3 dividing n}.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	2
5	4
6	2
7	2
8	4
9	6
10	4
11	10
12	4
13	4
14	2
15	8
16	8
17	16
18	6
19	6
20	8
21	4
22	10
23	22
24	8
25	20
26	4
27	18
28	4
29	28
30	8
31	10
32	16
33	20
34	16
35	8
36	12
37	12
38	6
39	8
40	16
41	40
42	4
43	14
44	20
45	24
46	22
47	46
48	16
49	14
50	20
51	32
52	8
53	52
54	18
55	40
56	8
57	12
58	28
59	58
60	16
61	20
62	10
63	12
64	32
65	16
66	20
67	22
68	32
69	44
70	8
71	70
72	24
73	24
74	12
75	40
76	12
77	20
78	8
79	26
80	32
81	54

n	a(n)
1	1
2	1
3	2
4	2
5	4
6	2
7	2
8	4
9	6
10	4
11	10
12	4
13	4
14	2
15	8
16	8
17	16
18	6
19	6
20	8
21	4
22	10
23	22
24	8
25	20
26	4
27	18
28	4
29	28
30	8
31	10
32	16
33	20
34	16
35	8
36	12
37	12
38	6
39	8
40	16
41	40
42	4
43	14
44	20
45	24
46	22
47	46
48	16
49	14
50	20
51	32
52	8
53	52
54	18
55	40
56	8
57	12
58	28
59	58
60	16
61	20
62	10
63	12
64	32
65	16
66	20
67	22
68	32
69	44
70	8
71	70
72	24
73	24
74	12
75	40
76	12
77	20
78	8
79	26
80	32
81	54

n	a(n)
1	1
2	1
3	2
4	2
5	4
6	2
7	2
8	4
9	6
10	4
11	10
12	4
13	4
14	2
15	8
16	8
17	16
18	6
19	6
20	8
21	4
22	10
23	22
24	8
25	20
26	4
27	18
28	4
29	28
30	8
31	10
32	16
33	20
34	16
35	8
36	12
37	12
38	6
39	8
40	16
41	40
42	4
43	14
44	20
45	24
46	22
47	46
48	16
49	14
50	20
51	32
52	8
53	52
54	18
55	40
56	8
57	12
58	28
59	58
60	16
61	20
62	10
63	12
64	32
65	16
66	20
67	22
68	32
69	44
70	8
71	70
72	24
73	24
74	12
75	40
76	12
77	20
78	8
79	26
80	32
81	54