A002180 - cp's OEIS frontend

A002180 Values taken by the half-totient function phi(m)/2.

n	a(n)
2	1
3	2
4	3
5	4
6	5
7	6
8	8
9	9
10	10
11	11
12	12
13	14
14	15
15	16
16	18
17	20
18	21
19	22
20	23
21	24
22	26
23	27
24	28
25	29
26	30
27	32
28	33
29	35
30	36
31	39
32	40
33	41
34	42
35	44
36	46
37	48
38	50
39	51
40	52
41	53
42	54
43	55
44	56
45	58
46	60
47	63
48	64
49	65
50	66
51	68
52	69
53	70
54	72
55	74
56	75
57	78
58	80
59	81
60	82
61	83
62	84
63	86
64	88
65	89
66	90
67	92

[1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 14, 15, 16, 18, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 32, 33, 35, 36, 39, 40, 41, 42, 44, 46, 48, 50, 51, 52, 53, 54, 55, 56, 58, 60, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 78, 80, 81, 82, 83, 84, 86, 88, 89, 90, 92]

cp's OEIS Frontend

A002180 Values taken by the half-totient function phi(m)/2.

Table of values

List of values

n	a(n)
2	1
3	2
4	3
5	4
6	5
7	6
8	8
9	9
10	10
11	11
12	12
13	14
14	15
15	16
16	18
17	20
18	21
19	22
20	23
21	24
22	26
23	27
24	28
25	29
26	30
27	32
28	33
29	35
30	36
31	39
32	40
33	41
34	42
35	44
36	46
37	48
38	50
39	51
40	52
41	53
42	54
43	55
44	56
45	58
46	60
47	63
48	64
49	65
50	66
51	68
52	69
53	70
54	72
55	74
56	75
57	78
58	80
59	81
60	82
61	83
62	84
63	86
64	88
65	89
66	90
67	92

n	a(n)
2	1
3	2
4	3
5	4
6	5
7	6
8	8
9	9
10	10
11	11
12	12
13	14
14	15
15	16
16	18
17	20
18	21
19	22
20	23
21	24
22	26
23	27
24	28
25	29
26	30
27	32
28	33
29	35
30	36
31	39
32	40
33	41
34	42
35	44
36	46
37	48
38	50
39	51
40	52
41	53
42	54
43	55
44	56
45	58
46	60
47	63
48	64
49	65
50	66
51	68
52	69
53	70
54	72
55	74
56	75
57	78
58	80
59	81
60	82
61	83
62	84
63	86
64	88
65	89
66	90
67	92

n	a(n)
2	1
3	2
4	3
5	4
6	5
7	6
8	8
9	9
10	10
11	11
12	12
13	14
14	15
15	16
16	18
17	20
18	21
19	22
20	23
21	24
22	26
23	27
24	28
25	29
26	30
27	32
28	33
29	35
30	36
31	39
32	40
33	41
34	42
35	44
36	46
37	48
38	50
39	51
40	52
41	53
42	54
43	55
44	56
45	58
46	60
47	63
48	64
49	65
50	66
51	68
52	69
53	70
54	72
55	74
56	75
57	78
58	80
59	81
60	82
61	83
62	84
63	86
64	88
65	89
66	90
67	92