A326067 - cp's OEIS frontend

A326067 a(n) = sigma(n) - sigma(A032742(n)) - n, where A032742 gives the largest proper divisor of n, and sigma is the sum of divisors of n.

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

[-1, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 4, 0, 2, 3, 0, 0, 8, 0, 4, 3, 2, 0, 8, 0, 2, 0, 4, 0, 18, 0, 0, 3, 2, 5, 16, 0, 2, 3, 8, 0, 22, 0, 4, 9, 2, 0, 16, 0, 12, 3, 4, 0, 26, 5, 8, 3, 2, 0, 36, 0, 2, 9, 0, 5, 30, 0, 4, 3, 26, 0, 32, 0, 2, 18, 4, 7, 34, 0, 16, 0, 2, 0, 44, 5, 2, 3, 8, 0, 66, 7, 4, 3, 2, 5, 32, 0, 16, 9, 24, 0, 42, 0, 8, 39]

cp's OEIS Frontend

A326067 a(n) = sigma(n) - sigma(A032742(n)) - n, where A032742 gives the largest proper divisor of n, and sigma is the sum of divisors of n.

Table of values

List of values

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

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

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