A338898 - cp's OEIS frontend

A338898 Concatenated sequence of prime indices of semiprimes (A001358).

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

[1, 1, 1, 2, 2, 2, 1, 3, 1, 4, 2, 3, 2, 4, 1, 5, 3, 3, 1, 6, 2, 5, 1, 7, 3, 4, 1, 8, 2, 6, 1, 9, 4, 4, 2, 7, 3, 5, 2, 8, 1, 10, 1, 11, 3, 6, 2, 9, 1, 12, 4, 5, 1, 13, 3, 7, 1, 14, 2, 10, 4, 6, 2, 11, 1, 15, 3, 8, 1, 16, 2, 12, 3, 9, 1, 17, 4, 7, 5, 5, 1, 18, 2]

cp's OEIS Frontend

A338898 Concatenated sequence of prime indices of semiprimes (A001358).

Table of values

List of values

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

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

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