A066671 - cp's OEIS frontend

A066671 a(n) is the largest power of 2 that divides phi(A066669(n)).

n	a(n)
1	2
2	2
3	2
4	4
5	2
6	2
7	4
8	2
9	2
10	4
11	4
12	4
13	4
14	4
15	8
16	4
17	8
18	8
19	4
20	4
21	8
22	2
23	2
24	4
25	8
26	4
27	8
28	8
29	4
30	2
31	16
32	4
33	4
34	8
35	8
36	8
37	8
38	8
39	2
40	8
41	8
42	8
43	8
44	8
45	4
46	2
47	32
48	8
49	16
50	16
51	4
52	2
53	8
54	16
55	16
56	8
57	8
58	2
59	32
60	16
61	16
62	8
63	8
64	4
65	16
66	4
67	16
68	16
69	4
70	8
71	32
72	16
73	8
74	16
75	16
76	2
77	2
78	16
79	4
80	8
81	16
82	4
83	8
84	2
85	16
86	8
87	32
88	4
89	64
90	32
91	32

[2, 2, 2, 4, 2, 2, 4, 2, 2, 4, 4, 4, 4, 4, 8, 4, 8, 8, 4, 4, 8, 2, 2, 4, 8, 4, 8, 8, 4, 2, 16, 4, 4, 8, 8, 8, 8, 8, 2, 8, 8, 8, 8, 8, 4, 2, 32, 8, 16, 16, 4, 2, 8, 16, 16, 8, 8, 2, 32, 16, 16, 8, 8, 4, 16, 4, 16, 16, 4, 8, 32, 16, 8, 16, 16, 2, 2, 16, 4, 8, 16, 4, 8, 2, 16, 8, 32, 4, 64, 32, 32]

cp's OEIS Frontend

A066671 a(n) is the largest power of 2 that divides phi(A066669(n)).

Table of values

List of values

n	a(n)
1	2
2	2
3	2
4	4
5	2
6	2
7	4
8	2
9	2
10	4
11	4
12	4
13	4
14	4
15	8
16	4
17	8
18	8
19	4
20	4
21	8
22	2
23	2
24	4
25	8
26	4
27	8
28	8
29	4
30	2
31	16
32	4
33	4
34	8
35	8
36	8
37	8
38	8
39	2
40	8
41	8
42	8
43	8
44	8
45	4
46	2
47	32
48	8
49	16
50	16
51	4
52	2
53	8
54	16
55	16
56	8
57	8
58	2
59	32
60	16
61	16
62	8
63	8
64	4
65	16
66	4
67	16
68	16
69	4
70	8
71	32
72	16
73	8
74	16
75	16
76	2
77	2
78	16
79	4
80	8
81	16
82	4
83	8
84	2
85	16
86	8
87	32
88	4
89	64
90	32
91	32

n	a(n)
1	2
2	2
3	2
4	4
5	2
6	2
7	4
8	2
9	2
10	4
11	4
12	4
13	4
14	4
15	8
16	4
17	8
18	8
19	4
20	4
21	8
22	2
23	2
24	4
25	8
26	4
27	8
28	8
29	4
30	2
31	16
32	4
33	4
34	8
35	8
36	8
37	8
38	8
39	2
40	8
41	8
42	8
43	8
44	8
45	4
46	2
47	32
48	8
49	16
50	16
51	4
52	2
53	8
54	16
55	16
56	8
57	8
58	2
59	32
60	16
61	16
62	8
63	8
64	4
65	16
66	4
67	16
68	16
69	4
70	8
71	32
72	16
73	8
74	16
75	16
76	2
77	2
78	16
79	4
80	8
81	16
82	4
83	8
84	2
85	16
86	8
87	32
88	4
89	64
90	32
91	32

n	a(n)
1	2
2	2
3	2
4	4
5	2
6	2
7	4
8	2
9	2
10	4
11	4
12	4
13	4
14	4
15	8
16	4
17	8
18	8
19	4
20	4
21	8
22	2
23	2
24	4
25	8
26	4
27	8
28	8
29	4
30	2
31	16
32	4
33	4
34	8
35	8
36	8
37	8
38	8
39	2
40	8
41	8
42	8
43	8
44	8
45	4
46	2
47	32
48	8
49	16
50	16
51	4
52	2
53	8
54	16
55	16
56	8
57	8
58	2
59	32
60	16
61	16
62	8
63	8
64	4
65	16
66	4
67	16
68	16
69	4
70	8
71	32
72	16
73	8
74	16
75	16
76	2
77	2
78	16
79	4
80	8
81	16
82	4
83	8
84	2
85	16
86	8
87	32
88	4
89	64
90	32
91	32