A066328 - cp's OEIS frontend

A066328 a(n) = sum of indices of distinct prime factors of n; here, index(i-th prime) = i.

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

[0, 1, 2, 1, 3, 3, 4, 1, 2, 4, 5, 3, 6, 5, 5, 1, 7, 3, 8, 4, 6, 6, 9, 3, 3, 7, 2, 5, 10, 6, 11, 1, 7, 8, 7, 3, 12, 9, 8, 4, 13, 7, 14, 6, 5, 10, 15, 3, 4, 4, 9, 7, 16, 3, 8, 5, 10, 11, 17, 6, 18, 12, 6, 1, 9, 8, 19, 8, 11, 8, 20, 3, 21, 13, 5, 9, 9, 9, 22, 4, 2, 14, 23, 7, 10, 15, 12, 6, 24, 6, 10]

cp's OEIS Frontend

A066328 a(n) = sum of indices of distinct prime factors of n; here, index(i-th prime) = i.

Table of values

List of values

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

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

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