A163515 - cp's OEIS frontend

A163515 If n-th composite is the product of k1-th prime, k2-th prime, ..., kr-th prime then set a(n) = k1 + k2 + ... + kr.

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

[2, 3, 3, 4, 4, 4, 5, 5, 4, 5, 5, 6, 6, 5, 6, 7, 6, 6, 6, 5, 7, 8, 7, 6, 9, 8, 6, 7, 7, 7, 10, 6, 8, 7, 9, 8, 7, 8, 7, 10, 11, 7, 12, 8, 6, 9, 8, 9, 11, 8, 7, 13, 8, 10, 9, 9, 7, 8, 14, 8, 10, 15, 12, 8, 8, 10, 11, 13, 16, 11, 7, 9, 9, 8, 10, 9, 9, 17, 8, 9, 14, 8, 11, 12, 12, 10, 18, 11, 8, 10, 19, 15]

cp's OEIS Frontend

A163515 If n-th composite is the product of k1-th prime, k2-th prime, ..., kr-th prime then set a(n) = k1 + k2 + ... + kr.

Table of values

List of values

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

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

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