A326066 - cp's OEIS frontend

A326066 a(n) = sigma(n) - sigma(A032742(n)), where A032742 gives the largest proper divisor of n.

n	a(n)
1	0
2	2
3	3
4	4
5	5
6	8
7	7
8	8
9	9
10	12
11	11
12	16
13	13
14	16
15	18
16	16
17	17
18	26
19	19
20	24
21	24
22	24
23	23
24	32
25	25
26	28
27	27
28	32
29	29
30	48
31	31
32	32
33	36
34	36
35	40
36	52
37	37
38	40
39	42
40	48
41	41
42	64
43	43
44	48
45	54
46	48
47	47
48	64
49	49
50	62
51	54
52	56
53	53
54	80
55	60
56	64
57	60
58	60
59	59
60	96
61	61
62	64
63	72
64	64
65	70
66	96
67	67
68	72
69	72
70	96
71	71
72	104
73	73
74	76
75	93
76	80
77	84
78	112
79	79
80	96
81	81
82	84
83	83

[0, 2, 3, 4, 5, 8, 7, 8, 9, 12, 11, 16, 13, 16, 18, 16, 17, 26, 19, 24, 24, 24, 23, 32, 25, 28, 27, 32, 29, 48, 31, 32, 36, 36, 40, 52, 37, 40, 42, 48, 41, 64, 43, 48, 54, 48, 47, 64, 49, 62, 54, 56, 53, 80, 60, 64, 60, 60, 59, 96, 61, 64, 72, 64, 70, 96, 67, 72, 72, 96, 71, 104, 73, 76, 93, 80, 84, 112, 79, 96, 81, 84, 83]

cp's OEIS Frontend

A326066 a(n) = sigma(n) - sigma(A032742(n)), where A032742 gives the largest proper divisor of n.

Table of values

List of values

n	a(n)
1	0
2	2
3	3
4	4
5	5
6	8
7	7
8	8
9	9
10	12
11	11
12	16
13	13
14	16
15	18
16	16
17	17
18	26
19	19
20	24
21	24
22	24
23	23
24	32
25	25
26	28
27	27
28	32
29	29
30	48
31	31
32	32
33	36
34	36
35	40
36	52
37	37
38	40
39	42
40	48
41	41
42	64
43	43
44	48
45	54
46	48
47	47
48	64
49	49
50	62
51	54
52	56
53	53
54	80
55	60
56	64
57	60
58	60
59	59
60	96
61	61
62	64
63	72
64	64
65	70
66	96
67	67
68	72
69	72
70	96
71	71
72	104
73	73
74	76
75	93
76	80
77	84
78	112
79	79
80	96
81	81
82	84
83	83

n	a(n)
1	0
2	2
3	3
4	4
5	5
6	8
7	7
8	8
9	9
10	12
11	11
12	16
13	13
14	16
15	18
16	16
17	17
18	26
19	19
20	24
21	24
22	24
23	23
24	32
25	25
26	28
27	27
28	32
29	29
30	48
31	31
32	32
33	36
34	36
35	40
36	52
37	37
38	40
39	42
40	48
41	41
42	64
43	43
44	48
45	54
46	48
47	47
48	64
49	49
50	62
51	54
52	56
53	53
54	80
55	60
56	64
57	60
58	60
59	59
60	96
61	61
62	64
63	72
64	64
65	70
66	96
67	67
68	72
69	72
70	96
71	71
72	104
73	73
74	76
75	93
76	80
77	84
78	112
79	79
80	96
81	81
82	84
83	83

n	a(n)
1	0
2	2
3	3
4	4
5	5
6	8
7	7
8	8
9	9
10	12
11	11
12	16
13	13
14	16
15	18
16	16
17	17
18	26
19	19
20	24
21	24
22	24
23	23
24	32
25	25
26	28
27	27
28	32
29	29
30	48
31	31
32	32
33	36
34	36
35	40
36	52
37	37
38	40
39	42
40	48
41	41
42	64
43	43
44	48
45	54
46	48
47	47
48	64
49	49
50	62
51	54
52	56
53	53
54	80
55	60
56	64
57	60
58	60
59	59
60	96
61	61
62	64
63	72
64	64
65	70
66	96
67	67
68	72
69	72
70	96
71	71
72	104
73	73
74	76
75	93
76	80
77	84
78	112
79	79
80	96
81	81
82	84
83	83