A381638 - cp's OEIS frontend

A381638 Numerators of Sum_{i=1..omega(n)-1} p_{i}/p_{i+1}, where omega(n) = A001221(n) and p_1 < p_2 < ... p_omega(n) are the distinct prime factors of n; a(1) = 0.

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

[0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 2, 0, 2, 3, 0, 0, 2, 0, 2, 3, 2, 0, 2, 0, 2, 0, 2, 0, 19, 0, 0, 3, 2, 5, 2, 0, 2, 3, 2, 0, 23, 0, 2, 3, 2, 0, 2, 0, 2, 3, 2, 0, 2, 5, 2, 3, 2, 0, 19, 0, 2, 3, 0, 5, 31, 0, 2, 3, 39, 0, 2, 0, 2, 3, 2, 7, 35, 0, 2, 0, 2, 0, 23, 5]

cp's OEIS Frontend

A381638 Numerators of Sum_{i=1..omega(n)-1} p_{i}/p_{i+1}, where omega(n) = A001221(n) and p_1 < p_2 < ... p_omega(n) are the distinct prime factors of n; a(1) = 0.

Table of values

List of values

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

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

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