A326136 - cp's OEIS frontend

A326136 a(n) = sigma(n) - sigma(A028234(n)), where sigma is the sum of divisors of n, and A028234 gives n without any occurrence of its smallest prime factor.

n	a(n)
1	0
2	2
3	3
4	6
5	5
6	8
7	7
8	14
9	12
10	12
11	11
12	24
13	13
14	16
15	18
16	30
17	17
18	26
19	19
20	36
21	24
22	24
23	23
24	56
25	30
26	28
27	39
28	48
29	29
30	48
31	31
32	62
33	36
34	36
35	40
36	78
37	37
38	40
39	42
40	84
41	41
42	64
43	43
44	72
45	72
46	48
47	47
48	120
49	56
50	62
51	54
52	84
53	53
54	80
55	60
56	112
57	60
58	60
59	59
60	144
61	61
62	64
63	96
64	126
65	70
66	96
67	67
68	108
69	72
70	96
71	71
72	182
73	73
74	76
75	93
76	120
77	84
78	112
79	79
80	180
81	120
82	84
83	83

[0, 2, 3, 6, 5, 8, 7, 14, 12, 12, 11, 24, 13, 16, 18, 30, 17, 26, 19, 36, 24, 24, 23, 56, 30, 28, 39, 48, 29, 48, 31, 62, 36, 36, 40, 78, 37, 40, 42, 84, 41, 64, 43, 72, 72, 48, 47, 120, 56, 62, 54, 84, 53, 80, 60, 112, 60, 60, 59, 144, 61, 64, 96, 126, 70, 96, 67, 108, 72, 96, 71, 182, 73, 76, 93, 120, 84, 112, 79, 180, 120, 84, 83]

cp's OEIS Frontend

A326136 a(n) = sigma(n) - sigma(A028234(n)), where sigma is the sum of divisors of n, and A028234 gives n without any occurrence of its smallest prime factor.

Table of values

List of values

n	a(n)
1	0
2	2
3	3
4	6
5	5
6	8
7	7
8	14
9	12
10	12
11	11
12	24
13	13
14	16
15	18
16	30
17	17
18	26
19	19
20	36
21	24
22	24
23	23
24	56
25	30
26	28
27	39
28	48
29	29
30	48
31	31
32	62
33	36
34	36
35	40
36	78
37	37
38	40
39	42
40	84
41	41
42	64
43	43
44	72
45	72
46	48
47	47
48	120
49	56
50	62
51	54
52	84
53	53
54	80
55	60
56	112
57	60
58	60
59	59
60	144
61	61
62	64
63	96
64	126
65	70
66	96
67	67
68	108
69	72
70	96
71	71
72	182
73	73
74	76
75	93
76	120
77	84
78	112
79	79
80	180
81	120
82	84
83	83

n	a(n)
1	0
2	2
3	3
4	6
5	5
6	8
7	7
8	14
9	12
10	12
11	11
12	24
13	13
14	16
15	18
16	30
17	17
18	26
19	19
20	36
21	24
22	24
23	23
24	56
25	30
26	28
27	39
28	48
29	29
30	48
31	31
32	62
33	36
34	36
35	40
36	78
37	37
38	40
39	42
40	84
41	41
42	64
43	43
44	72
45	72
46	48
47	47
48	120
49	56
50	62
51	54
52	84
53	53
54	80
55	60
56	112
57	60
58	60
59	59
60	144
61	61
62	64
63	96
64	126
65	70
66	96
67	67
68	108
69	72
70	96
71	71
72	182
73	73
74	76
75	93
76	120
77	84
78	112
79	79
80	180
81	120
82	84
83	83

n	a(n)
1	0
2	2
3	3
4	6
5	5
6	8
7	7
8	14
9	12
10	12
11	11
12	24
13	13
14	16
15	18
16	30
17	17
18	26
19	19
20	36
21	24
22	24
23	23
24	56
25	30
26	28
27	39
28	48
29	29
30	48
31	31
32	62
33	36
34	36
35	40
36	78
37	37
38	40
39	42
40	84
41	41
42	64
43	43
44	72
45	72
46	48
47	47
48	120
49	56
50	62
51	54
52	84
53	53
54	80
55	60
56	112
57	60
58	60
59	59
60	144
61	61
62	64
63	96
64	126
65	70
66	96
67	67
68	108
69	72
70	96
71	71
72	182
73	73
74	76
75	93
76	120
77	84
78	112
79	79
80	180
81	120
82	84
83	83