A243823 - cp's OEIS frontend

A243823 Quantity of "semitotatives," numbers m < n that are products of at least one prime divisor p of n and one prime q coprime to n.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	1
9	1
10	1
11	0
12	1
13	0
14	3
15	3
16	4
17	0
18	3
19	0
20	5
21	5
22	6
23	0
24	6
25	3
26	8
27	6
28	9
29	0
30	5
31	0
32	11
33	8
34	11
35	7
36	11
37	0
38	13
39	10
40	14
41	0
42	12
43	0
44	16
45	14
46	17
47	0
48	18
49	5
50	19
51	14
52	20
53	0
54	21
55	11
56	22
57	16
58	23
59	0
60	19
61	0
62	25
63	20
64	26
65	13
66	25
67	0
68	27
69	20
70	27
71	0
72	31
73	0
74	30
75	27
76	31
77	13
78	32
79	0
80	35
81	23
82	34
83	0
84	33
85	17
86	36
87	25
88	38
89	0
90	35
91	15
92	39
93	27
94	40
95	19
96	45
97	0
98	44
99	32
100	46

[0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 3, 3, 4, 0, 3, 0, 5, 5, 6, 0, 6, 3, 8, 6, 9, 0, 5, 0, 11, 8, 11, 7, 11, 0, 13, 10, 14, 0, 12, 0, 16, 14, 17, 0, 18, 5, 19, 14, 20, 0, 21, 11, 22, 16, 23, 0, 19, 0, 25, 20, 26, 13, 25, 0, 27, 20, 27, 0, 31, 0, 30, 27, 31, 13, 32, 0, 35, 23, 34, 0, 33, 17, 36, 25, 38, 0, 35, 15, 39, 27, 40, 19, 45, 0, 44, 32, 46]

cp's OEIS Frontend

A243823 Quantity of "semitotatives," numbers m < n that are products of at least one prime divisor p of n and one prime q 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	1
9	1
10	1
11	0
12	1
13	0
14	3
15	3
16	4
17	0
18	3
19	0
20	5
21	5
22	6
23	0
24	6
25	3
26	8
27	6
28	9
29	0
30	5
31	0
32	11
33	8
34	11
35	7
36	11
37	0
38	13
39	10
40	14
41	0
42	12
43	0
44	16
45	14
46	17
47	0
48	18
49	5
50	19
51	14
52	20
53	0
54	21
55	11
56	22
57	16
58	23
59	0
60	19
61	0
62	25
63	20
64	26
65	13
66	25
67	0
68	27
69	20
70	27
71	0
72	31
73	0
74	30
75	27
76	31
77	13
78	32
79	0
80	35
81	23
82	34
83	0
84	33
85	17
86	36
87	25
88	38
89	0
90	35
91	15
92	39
93	27
94	40
95	19
96	45
97	0
98	44
99	32
100	46

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	1
9	1
10	1
11	0
12	1
13	0
14	3
15	3
16	4
17	0
18	3
19	0
20	5
21	5
22	6
23	0
24	6
25	3
26	8
27	6
28	9
29	0
30	5
31	0
32	11
33	8
34	11
35	7
36	11
37	0
38	13
39	10
40	14
41	0
42	12
43	0
44	16
45	14
46	17
47	0
48	18
49	5
50	19
51	14
52	20
53	0
54	21
55	11
56	22
57	16
58	23
59	0
60	19
61	0
62	25
63	20
64	26
65	13
66	25
67	0
68	27
69	20
70	27
71	0
72	31
73	0
74	30
75	27
76	31
77	13
78	32
79	0
80	35
81	23
82	34
83	0
84	33
85	17
86	36
87	25
88	38
89	0
90	35
91	15
92	39
93	27
94	40
95	19
96	45
97	0
98	44
99	32
100	46

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	1
9	1
10	1
11	0
12	1
13	0
14	3
15	3
16	4
17	0
18	3
19	0
20	5
21	5
22	6
23	0
24	6
25	3
26	8
27	6
28	9
29	0
30	5
31	0
32	11
33	8
34	11
35	7
36	11
37	0
38	13
39	10
40	14
41	0
42	12
43	0
44	16
45	14
46	17
47	0
48	18
49	5
50	19
51	14
52	20
53	0
54	21
55	11
56	22
57	16
58	23
59	0
60	19
61	0
62	25
63	20
64	26
65	13
66	25
67	0
68	27
69	20
70	27
71	0
72	31
73	0
74	30
75	27
76	31
77	13
78	32
79	0
80	35
81	23
82	34
83	0
84	33
85	17
86	36
87	25
88	38
89	0
90	35
91	15
92	39
93	27
94	40
95	19
96	45
97	0
98	44
99	32
100	46