A076360 - cp's OEIS frontend

A076360 a(n) = d(sigma(n)) - sigma(d(n)), where d(n) is the number of divisors of n and sigma(n) is their sum.

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

[0, -1, 0, -2, 1, -1, 1, -3, -2, -1, 3, -6, 1, 1, 1, -4, 3, -8, 3, -4, -1, 2, 5, -3, -2, 1, 1, -4, 5, -3, 3, -6, 3, 1, 3, -9, 1, 5, 1, -3, 5, -3, 3, 0, -4, 5, 7, -12, 0, -8, 5, -6, 5, 1, 5, 1, 3, 5, 9, -12, 1, 5, -4, -6, 5, 0, 3, 0, 5, 0, 9, -20, 1, 1, -6, 0, 5, 1, 7, -10, -3, 5, 9, -16, 5, 5, 9, 3, 9, -16, 3, 4, 1, 8, 9, -10, 3, -6, 0, -9, 5, 1, 5, 1, -1]

cp's OEIS Frontend

A076360 a(n) = d(sigma(n)) - sigma(d(n)), where d(n) is the number of divisors of n and sigma(n) is their sum.

Table of values

List of values

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

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

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