A174956 - cp's OEIS frontend

A174956 0 unless n is the k-th semiprime when a(n) = k.

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

[0, 0, 0, 1, 0, 2, 0, 0, 3, 4, 0, 0, 0, 5, 6, 0, 0, 0, 0, 0, 7, 8, 0, 0, 9, 10, 0, 0, 0, 0, 0, 0, 11, 12, 13, 0, 0, 14, 15, 0, 0, 0, 0, 0, 0, 16, 0, 0, 17, 0, 18, 0, 0, 0, 19, 0, 20, 21, 0, 0, 0, 22, 0, 0, 23, 0, 0, 0, 24, 0, 0, 0, 0, 25, 0, 0, 26, 0, 0, 0, 0, 27, 0, 0, 28, 29, 30, 0, 0, 0, 31, 0, 32, 33]

cp's OEIS Frontend

A174956 0 unless n is the k-th semiprime when a(n) = k.

Table of values

List of values

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

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

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