A346692 - cp's OEIS frontend

A346692 a(n) = phi(n) - phi(n-phi(n)), a(1) = 1.

n	a(n)
1	1
2	0
3	1
4	1
5	3
6	0
7	5
8	2
9	4
10	2
11	9
12	0
13	11
14	2
15	2
16	4
17	15
18	2
19	17
20	4
21	6
22	6
23	21
24	0
25	16
26	6
27	12
28	4
29	27
30	-2
31	29
32	8
33	8
34	10
35	14
36	4
37	35
38	10
39	16
40	8
41	39
42	4
43	41
44	12
45	12
46	14
47	45
48	0
49	36
50	12
51	14
52	12
53	51
54	6
55	32
56	8
57	24
58	20
59	57
60	-4
61	59
62	14
63	18
64	16
65	32
66	-2
67	65
68	20
69	24
70	2
71	69
72	8
73	71
74	18
75	16
76	20
77	44
78	6
79	77
80	16

[1, 0, 1, 1, 3, 0, 5, 2, 4, 2, 9, 0, 11, 2, 2, 4, 15, 2, 17, 4, 6, 6, 21, 0, 16, 6, 12, 4, 27, -2, 29, 8, 8, 10, 14, 4, 35, 10, 16, 8, 39, 4, 41, 12, 12, 14, 45, 0, 36, 12, 14, 12, 51, 6, 32, 8, 24, 20, 57, -4, 59, 14, 18, 16, 32, -2, 65, 20, 24, 2, 69, 8, 71, 18, 16, 20, 44, 6, 77, 16]

cp's OEIS Frontend

A346692 a(n) = phi(n) - phi(n-phi(n)), a(1) = 1.

Table of values

List of values

n	a(n)
1	1
2	0
3	1
4	1
5	3
6	0
7	5
8	2
9	4
10	2
11	9
12	0
13	11
14	2
15	2
16	4
17	15
18	2
19	17
20	4
21	6
22	6
23	21
24	0
25	16
26	6
27	12
28	4
29	27
30	-2
31	29
32	8
33	8
34	10
35	14
36	4
37	35
38	10
39	16
40	8
41	39
42	4
43	41
44	12
45	12
46	14
47	45
48	0
49	36
50	12
51	14
52	12
53	51
54	6
55	32
56	8
57	24
58	20
59	57
60	-4
61	59
62	14
63	18
64	16
65	32
66	-2
67	65
68	20
69	24
70	2
71	69
72	8
73	71
74	18
75	16
76	20
77	44
78	6
79	77
80	16

n	a(n)
1	1
2	0
3	1
4	1
5	3
6	0
7	5
8	2
9	4
10	2
11	9
12	0
13	11
14	2
15	2
16	4
17	15
18	2
19	17
20	4
21	6
22	6
23	21
24	0
25	16
26	6
27	12
28	4
29	27
30	-2
31	29
32	8
33	8
34	10
35	14
36	4
37	35
38	10
39	16
40	8
41	39
42	4
43	41
44	12
45	12
46	14
47	45
48	0
49	36
50	12
51	14
52	12
53	51
54	6
55	32
56	8
57	24
58	20
59	57
60	-4
61	59
62	14
63	18
64	16
65	32
66	-2
67	65
68	20
69	24
70	2
71	69
72	8
73	71
74	18
75	16
76	20
77	44
78	6
79	77
80	16

n	a(n)
1	1
2	0
3	1
4	1
5	3
6	0
7	5
8	2
9	4
10	2
11	9
12	0
13	11
14	2
15	2
16	4
17	15
18	2
19	17
20	4
21	6
22	6
23	21
24	0
25	16
26	6
27	12
28	4
29	27
30	-2
31	29
32	8
33	8
34	10
35	14
36	4
37	35
38	10
39	16
40	8
41	39
42	4
43	41
44	12
45	12
46	14
47	45
48	0
49	36
50	12
51	14
52	12
53	51
54	6
55	32
56	8
57	24
58	20
59	57
60	-4
61	59
62	14
63	18
64	16
65	32
66	-2
67	65
68	20
69	24
70	2
71	69
72	8
73	71
74	18
75	16
76	20
77	44
78	6
79	77
80	16