A144764 - cp's OEIS frontend

A144764 Partial totient function phi(c, n) for c = 3: number of 3-semiprimes less than and coprime to n.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	1
10	0
11	1
12	0
13	2
14	0
15	1
16	0
17	2
18	0
19	3
20	0
21	2
22	0
23	4
24	0
25	3
26	0
27	2
28	1
29	6
30	0
31	7
32	1
33	3
34	1
35	4
36	0
37	7
38	1
39	3
40	1
41	7
42	0
43	8
44	1
45	3
46	2
47	10
48	0
49	8
50	1
51	5
52	2
53	12
54	0
55	7
56	2
57	6
58	2
59	12
60	0
61	12
62	2
63	5
64	3
65	8
66	0
67	14
68	3
69	7
70	1
71	16
72	0
73	16
74	3
75	5
76	4
77	12
78	0
79	19
80	2
81	9
82	4
83	19
84	0
85	12
86	4
87	9
88	4
89	19
90	0
91	13
92	4
93	10
94	4
95	13
96	0
97	20
98	3

[0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 2, 0, 1, 0, 2, 0, 3, 0, 2, 0, 4, 0, 3, 0, 2, 1, 6, 0, 7, 1, 3, 1, 4, 0, 7, 1, 3, 1, 7, 0, 8, 1, 3, 2, 10, 0, 8, 1, 5, 2, 12, 0, 7, 2, 6, 2, 12, 0, 12, 2, 5, 3, 8, 0, 14, 3, 7, 1, 16, 0, 16, 3, 5, 4, 12, 0, 19, 2, 9, 4, 19, 0, 12, 4, 9, 4, 19, 0, 13, 4, 10, 4, 13, 0, 20, 3]

cp's OEIS Frontend

A144764 Partial totient function phi(c, n) for c = 3: number of 3-semiprimes less than and coprime to n.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	1
10	0
11	1
12	0
13	2
14	0
15	1
16	0
17	2
18	0
19	3
20	0
21	2
22	0
23	4
24	0
25	3
26	0
27	2
28	1
29	6
30	0
31	7
32	1
33	3
34	1
35	4
36	0
37	7
38	1
39	3
40	1
41	7
42	0
43	8
44	1
45	3
46	2
47	10
48	0
49	8
50	1
51	5
52	2
53	12
54	0
55	7
56	2
57	6
58	2
59	12
60	0
61	12
62	2
63	5
64	3
65	8
66	0
67	14
68	3
69	7
70	1
71	16
72	0
73	16
74	3
75	5
76	4
77	12
78	0
79	19
80	2
81	9
82	4
83	19
84	0
85	12
86	4
87	9
88	4
89	19
90	0
91	13
92	4
93	10
94	4
95	13
96	0
97	20
98	3

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	1
10	0
11	1
12	0
13	2
14	0
15	1
16	0
17	2
18	0
19	3
20	0
21	2
22	0
23	4
24	0
25	3
26	0
27	2
28	1
29	6
30	0
31	7
32	1
33	3
34	1
35	4
36	0
37	7
38	1
39	3
40	1
41	7
42	0
43	8
44	1
45	3
46	2
47	10
48	0
49	8
50	1
51	5
52	2
53	12
54	0
55	7
56	2
57	6
58	2
59	12
60	0
61	12
62	2
63	5
64	3
65	8
66	0
67	14
68	3
69	7
70	1
71	16
72	0
73	16
74	3
75	5
76	4
77	12
78	0
79	19
80	2
81	9
82	4
83	19
84	0
85	12
86	4
87	9
88	4
89	19
90	0
91	13
92	4
93	10
94	4
95	13
96	0
97	20
98	3

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	1
10	0
11	1
12	0
13	2
14	0
15	1
16	0
17	2
18	0
19	3
20	0
21	2
22	0
23	4
24	0
25	3
26	0
27	2
28	1
29	6
30	0
31	7
32	1
33	3
34	1
35	4
36	0
37	7
38	1
39	3
40	1
41	7
42	0
43	8
44	1
45	3
46	2
47	10
48	0
49	8
50	1
51	5
52	2
53	12
54	0
55	7
56	2
57	6
58	2
59	12
60	0
61	12
62	2
63	5
64	3
65	8
66	0
67	14
68	3
69	7
70	1
71	16
72	0
73	16
74	3
75	5
76	4
77	12
78	0
79	19
80	2
81	9
82	4
83	19
84	0
85	12
86	4
87	9
88	4
89	19
90	0
91	13
92	4
93	10
94	4
95	13
96	0
97	20
98	3