A326068 - cp's OEIS frontend

A326068 a(n) = n - sigma(A032742(n)), where sigma is the sum of divisors of n and A032742 gives the largest proper divisor of n.

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

[0, 1, 2, 1, 4, 2, 6, 1, 5, 4, 10, 0, 12, 6, 9, 1, 16, 5, 18, 2, 13, 10, 22, -4, 19, 12, 14, 4, 28, 6, 30, 1, 21, 16, 27, -3, 36, 18, 25, -2, 40, 10, 42, 8, 21, 22, 46, -12, 41, 19, 33, 10, 52, 14, 43, 0, 37, 28, 58, -12, 60, 30, 31, 1, 51, 18, 66, 14, 45, 22, 70, -19, 72, 36, 44, 16, 65, 22, 78, -10, 41, 40, 82, -12, 67, 42, 57, 4, 88, 12]

cp's OEIS Frontend

A326068 a(n) = n - sigma(A032742(n)), where sigma is the sum of divisors of n and A032742 gives the largest proper divisor of n.

Table of values

List of values

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

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

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