A144741 - cp's OEIS frontend

A144741 Number of semiprimes less than or equal to and not coprime to n.

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

[0, 0, 0, 1, 0, 2, 0, 2, 2, 3, 0, 4, 0, 4, 4, 4, 0, 6, 0, 5, 5, 5, 0, 8, 3, 6, 4, 7, 0, 10, 0, 6, 6, 7, 6, 11, 0, 8, 7, 11, 0, 14, 0, 9, 9, 9, 0, 14, 4, 12, 8, 10, 0, 15, 7, 12, 9, 10, 0, 20, 0, 11, 11, 11, 8, 19, 0, 12, 10, 18, 0, 19, 0, 12, 14, 13, 8, 21, 0, 17, 9, 13, 0, 24, 9, 14, 11, 17, 0, 28, 9]

cp's OEIS Frontend

A144741 Number of semiprimes less than or equal to and not coprime to n.

Table of values

List of values

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

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

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