A338899 - cp's OEIS frontend

A338899 Concatenated sequence of prime indices of squarefree semiprimes (A006881).

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

[1, 2, 1, 3, 1, 4, 2, 3, 2, 4, 1, 5, 1, 6, 2, 5, 1, 7, 3, 4, 1, 8, 2, 6, 1, 9, 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, 1, 18, 2, 13, 2, 14, 4, 8, 1, 19, 2, 15]

cp's OEIS Frontend

A338899 Concatenated sequence of prime indices of squarefree semiprimes (A006881).

Table of values

List of values

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

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

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