A055631 - cp's OEIS frontend

A055631 Sum of Euler's totient function phi of distinct primes dividing n.

n	a(n)
1	0
2	1
3	2
4	1
5	4
6	3
7	6
8	1
9	2
10	5
11	10
12	3
13	12
14	7
15	6
16	1
17	16
18	3
19	18
20	5
21	8
22	11
23	22
24	3
25	4
26	13
27	2
28	7
29	28
30	7
31	30
32	1
33	12
34	17
35	10
36	3
37	36
38	19
39	14
40	5
41	40
42	9
43	42
44	11
45	6
46	23
47	46
48	3
49	6
50	5
51	18
52	13
53	52
54	3
55	14
56	7
57	20
58	29
59	58
60	7
61	60
62	31
63	8
64	1
65	16
66	13
67	66
68	17
69	24
70	11
71	70
72	3
73	72
74	37
75	6
76	19
77	16
78	15
79	78
80	5
81	2

[0, 1, 2, 1, 4, 3, 6, 1, 2, 5, 10, 3, 12, 7, 6, 1, 16, 3, 18, 5, 8, 11, 22, 3, 4, 13, 2, 7, 28, 7, 30, 1, 12, 17, 10, 3, 36, 19, 14, 5, 40, 9, 42, 11, 6, 23, 46, 3, 6, 5, 18, 13, 52, 3, 14, 7, 20, 29, 58, 7, 60, 31, 8, 1, 16, 13, 66, 17, 24, 11, 70, 3, 72, 37, 6, 19, 16, 15, 78, 5, 2]

cp's OEIS Frontend

A055631 Sum of Euler's totient function phi of distinct primes dividing n.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	1
5	4
6	3
7	6
8	1
9	2
10	5
11	10
12	3
13	12
14	7
15	6
16	1
17	16
18	3
19	18
20	5
21	8
22	11
23	22
24	3
25	4
26	13
27	2
28	7
29	28
30	7
31	30
32	1
33	12
34	17
35	10
36	3
37	36
38	19
39	14
40	5
41	40
42	9
43	42
44	11
45	6
46	23
47	46
48	3
49	6
50	5
51	18
52	13
53	52
54	3
55	14
56	7
57	20
58	29
59	58
60	7
61	60
62	31
63	8
64	1
65	16
66	13
67	66
68	17
69	24
70	11
71	70
72	3
73	72
74	37
75	6
76	19
77	16
78	15
79	78
80	5
81	2

n	a(n)
1	0
2	1
3	2
4	1
5	4
6	3
7	6
8	1
9	2
10	5
11	10
12	3
13	12
14	7
15	6
16	1
17	16
18	3
19	18
20	5
21	8
22	11
23	22
24	3
25	4
26	13
27	2
28	7
29	28
30	7
31	30
32	1
33	12
34	17
35	10
36	3
37	36
38	19
39	14
40	5
41	40
42	9
43	42
44	11
45	6
46	23
47	46
48	3
49	6
50	5
51	18
52	13
53	52
54	3
55	14
56	7
57	20
58	29
59	58
60	7
61	60
62	31
63	8
64	1
65	16
66	13
67	66
68	17
69	24
70	11
71	70
72	3
73	72
74	37
75	6
76	19
77	16
78	15
79	78
80	5
81	2

n	a(n)
1	0
2	1
3	2
4	1
5	4
6	3
7	6
8	1
9	2
10	5
11	10
12	3
13	12
14	7
15	6
16	1
17	16
18	3
19	18
20	5
21	8
22	11
23	22
24	3
25	4
26	13
27	2
28	7
29	28
30	7
31	30
32	1
33	12
34	17
35	10
36	3
37	36
38	19
39	14
40	5
41	40
42	9
43	42
44	11
45	6
46	23
47	46
48	3
49	6
50	5
51	18
52	13
53	52
54	3
55	14
56	7
57	20
58	29
59	58
60	7
61	60
62	31
63	8
64	1
65	16
66	13
67	66
68	17
69	24
70	11
71	70
72	3
73	72
74	37
75	6
76	19
77	16
78	15
79	78
80	5
81	2