A261079 - cp's OEIS frontend

A261079 Sum of index differences between prime factors of n, summed over all unordered pairs of primes present (with multiplicity) in the prime factorization of n.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	0
8	0
9	0
10	2
11	0
12	2
13	0
14	3
15	1
16	0
17	0
18	2
19	0
20	4
21	2
22	4
23	0
24	3
25	0
26	5
27	0
28	6
29	0
30	4
31	0
32	0
33	3
34	6
35	1
36	4
37	0
38	7
39	4
40	6
41	0
42	6
43	0
44	8
45	2
46	8
47	0
48	4
49	0
50	4
51	5
52	10
53	0
54	3
55	2
56	9
57	6
58	9
59	0
60	7
61	0
62	10
63	4
64	0
65	3
66	8
67	0
68	12
69	7
70	6
71	0
72	6
73	0
74	11
75	2
76	14
77	1
78	10
79	0
80	8
81	0
82	12
83	0
84	10
85	4
86	13
87	8
88	12
89	0
90	6
91	2
92	16
93	9
94	14
95	5
96	5
97	0
98	6
99	6
100	8
101	0
102	12
103	0
104	15
105	4
106	15
107	0
108	6
109	0
110	8
111	10
112	12
113	0
114	14
115	6
116	18
117	8
118	16
119	3
120	10

[0, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 2, 0, 3, 1, 0, 0, 2, 0, 4, 2, 4, 0, 3, 0, 5, 0, 6, 0, 4, 0, 0, 3, 6, 1, 4, 0, 7, 4, 6, 0, 6, 0, 8, 2, 8, 0, 4, 0, 4, 5, 10, 0, 3, 2, 9, 6, 9, 0, 7, 0, 10, 4, 0, 3, 8, 0, 12, 7, 6, 0, 6, 0, 11, 2, 14, 1, 10, 0, 8, 0, 12, 0, 10, 4, 13, 8, 12, 0, 6, 2, 16, 9, 14, 5, 5, 0, 6, 6, 8, 0, 12, 0, 15, 4, 15, 0, 6, 0, 8, 10, 12, 0, 14, 6, 18, 8, 16, 3, 10]

cp's OEIS Frontend

A261079 Sum of index differences between prime factors of n, summed over all unordered pairs of primes present (with multiplicity) in the prime factorization of n.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	0
8	0
9	0
10	2
11	0
12	2
13	0
14	3
15	1
16	0
17	0
18	2
19	0
20	4
21	2
22	4
23	0
24	3
25	0
26	5
27	0
28	6
29	0
30	4
31	0
32	0
33	3
34	6
35	1
36	4
37	0
38	7
39	4
40	6
41	0
42	6
43	0
44	8
45	2
46	8
47	0
48	4
49	0
50	4
51	5
52	10
53	0
54	3
55	2
56	9
57	6
58	9
59	0
60	7
61	0
62	10
63	4
64	0
65	3
66	8
67	0
68	12
69	7
70	6
71	0
72	6
73	0
74	11
75	2
76	14
77	1
78	10
79	0
80	8
81	0
82	12
83	0
84	10
85	4
86	13
87	8
88	12
89	0
90	6
91	2
92	16
93	9
94	14
95	5
96	5
97	0
98	6
99	6
100	8
101	0
102	12
103	0
104	15
105	4
106	15
107	0
108	6
109	0
110	8
111	10
112	12
113	0
114	14
115	6
116	18
117	8
118	16
119	3
120	10

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	0
8	0
9	0
10	2
11	0
12	2
13	0
14	3
15	1
16	0
17	0
18	2
19	0
20	4
21	2
22	4
23	0
24	3
25	0
26	5
27	0
28	6
29	0
30	4
31	0
32	0
33	3
34	6
35	1
36	4
37	0
38	7
39	4
40	6
41	0
42	6
43	0
44	8
45	2
46	8
47	0
48	4
49	0
50	4
51	5
52	10
53	0
54	3
55	2
56	9
57	6
58	9
59	0
60	7
61	0
62	10
63	4
64	0
65	3
66	8
67	0
68	12
69	7
70	6
71	0
72	6
73	0
74	11
75	2
76	14
77	1
78	10
79	0
80	8
81	0
82	12
83	0
84	10
85	4
86	13
87	8
88	12
89	0
90	6
91	2
92	16
93	9
94	14
95	5
96	5
97	0
98	6
99	6
100	8
101	0
102	12
103	0
104	15
105	4
106	15
107	0
108	6
109	0
110	8
111	10
112	12
113	0
114	14
115	6
116	18
117	8
118	16
119	3
120	10

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	0
8	0
9	0
10	2
11	0
12	2
13	0
14	3
15	1
16	0
17	0
18	2
19	0
20	4
21	2
22	4
23	0
24	3
25	0
26	5
27	0
28	6
29	0
30	4
31	0
32	0
33	3
34	6
35	1
36	4
37	0
38	7
39	4
40	6
41	0
42	6
43	0
44	8
45	2
46	8
47	0
48	4
49	0
50	4
51	5
52	10
53	0
54	3
55	2
56	9
57	6
58	9
59	0
60	7
61	0
62	10
63	4
64	0
65	3
66	8
67	0
68	12
69	7
70	6
71	0
72	6
73	0
74	11
75	2
76	14
77	1
78	10
79	0
80	8
81	0
82	12
83	0
84	10
85	4
86	13
87	8
88	12
89	0
90	6
91	2
92	16
93	9
94	14
95	5
96	5
97	0
98	6
99	6
100	8
101	0
102	12
103	0
104	15
105	4
106	15
107	0
108	6
109	0
110	8
111	10
112	12
113	0
114	14
115	6
116	18
117	8
118	16
119	3
120	10