A129235 - cp's OEIS frontend

A129235 a(n) = 2*sigma(n) - tau(n), where tau(n) is the number of divisors of n (A000005) and sigma(n) is the sum of divisors of n (A000203).

n	a(n)
1	1
2	4
3	6
4	11
5	10
6	20
7	14
8	26
9	23
10	32
11	22
12	50
13	26
14	44
15	44
16	57
17	34
18	72
19	38
20	78
21	60
22	68
23	46
24	112
25	59
26	80
27	76
28	106
29	58
30	136
31	62
32	120
33	92
34	104
35	92
36	173
37	74
38	116
39	108
40	172
41	82
42	184
43	86
44	162
45	150
46	140
47	94
48	238
49	111
50	180
51	140
52	190
53	106
54	232
55	140
56	232
57	156
58	176
59	118
60	324
61	122
62	188

[1, 4, 6, 11, 10, 20, 14, 26, 23, 32, 22, 50, 26, 44, 44, 57, 34, 72, 38, 78, 60, 68, 46, 112, 59, 80, 76, 106, 58, 136, 62, 120, 92, 104, 92, 173, 74, 116, 108, 172, 82, 184, 86, 162, 150, 140, 94, 238, 111, 180, 140, 190, 106, 232, 140, 232, 156, 176, 118, 324, 122, 188]

cp's OEIS Frontend

A129235 a(n) = 2*sigma(n) - tau(n), where tau(n) is the number of divisors of n (A000005) and sigma(n) is the sum of divisors of n (A000203).

Table of values

List of values

n	a(n)
1	1
2	4
3	6
4	11
5	10
6	20
7	14
8	26
9	23
10	32
11	22
12	50
13	26
14	44
15	44
16	57
17	34
18	72
19	38
20	78
21	60
22	68
23	46
24	112
25	59
26	80
27	76
28	106
29	58
30	136
31	62
32	120
33	92
34	104
35	92
36	173
37	74
38	116
39	108
40	172
41	82
42	184
43	86
44	162
45	150
46	140
47	94
48	238
49	111
50	180
51	140
52	190
53	106
54	232
55	140
56	232
57	156
58	176
59	118
60	324
61	122
62	188

n	a(n)
1	1
2	4
3	6
4	11
5	10
6	20
7	14
8	26
9	23
10	32
11	22
12	50
13	26
14	44
15	44
16	57
17	34
18	72
19	38
20	78
21	60
22	68
23	46
24	112
25	59
26	80
27	76
28	106
29	58
30	136
31	62
32	120
33	92
34	104
35	92
36	173
37	74
38	116
39	108
40	172
41	82
42	184
43	86
44	162
45	150
46	140
47	94
48	238
49	111
50	180
51	140
52	190
53	106
54	232
55	140
56	232
57	156
58	176
59	118
60	324
61	122
62	188

n	a(n)
1	1
2	4
3	6
4	11
5	10
6	20
7	14
8	26
9	23
10	32
11	22
12	50
13	26
14	44
15	44
16	57
17	34
18	72
19	38
20	78
21	60
22	68
23	46
24	112
25	59
26	80
27	76
28	106
29	58
30	136
31	62
32	120
33	92
34	104
35	92
36	173
37	74
38	116
39	108
40	172
41	82
42	184
43	86
44	162
45	150
46	140
47	94
48	238
49	111
50	180
51	140
52	190
53	106
54	232
55	140
56	232
57	156
58	176
59	118
60	324
61	122
62	188