A132631 - cp's OEIS frontend

A132631 Numbers k such that sigma(k+1)-k-1 divides sigma(k)-k, where sigma(k) is sum of positive divisors of n.

n	a(n)
1	2
2	4
3	6
4	10
5	12
6	16
7	18
8	20
9	22
10	24
11	28
12	30
13	36
14	40
15	42
16	46
17	52
18	58
19	60
20	66
21	70
22	72
23	78
24	82
25	88
26	94
27	96
28	100
29	102
30	106
31	108
32	112
33	120
34	126
35	130
36	136
37	138
38	148
39	150
40	156
41	162
42	166
43	172
44	178
45	180
46	190
47	192
48	196
49	198

[2, 4, 6, 10, 12, 16, 18, 20, 22, 24, 28, 30, 36, 40, 42, 46, 52, 58, 60, 66, 70, 72, 78, 82, 88, 94, 96, 100, 102, 106, 108, 112, 120, 126, 130, 136, 138, 148, 150, 156, 162, 166, 172, 178, 180, 190, 192, 196, 198]

cp's OEIS Frontend

A132631 Numbers k such that sigma(k+1)-k-1 divides sigma(k)-k, where sigma(k) is sum of positive divisors of n.

Table of values

List of values

n	a(n)
1	2
2	4
3	6
4	10
5	12
6	16
7	18
8	20
9	22
10	24
11	28
12	30
13	36
14	40
15	42
16	46
17	52
18	58
19	60
20	66
21	70
22	72
23	78
24	82
25	88
26	94
27	96
28	100
29	102
30	106
31	108
32	112
33	120
34	126
35	130
36	136
37	138
38	148
39	150
40	156
41	162
42	166
43	172
44	178
45	180
46	190
47	192
48	196
49	198

n	a(n)
1	2
2	4
3	6
4	10
5	12
6	16
7	18
8	20
9	22
10	24
11	28
12	30
13	36
14	40
15	42
16	46
17	52
18	58
19	60
20	66
21	70
22	72
23	78
24	82
25	88
26	94
27	96
28	100
29	102
30	106
31	108
32	112
33	120
34	126
35	130
36	136
37	138
38	148
39	150
40	156
41	162
42	166
43	172
44	178
45	180
46	190
47	192
48	196
49	198

n	a(n)
1	2
2	4
3	6
4	10
5	12
6	16
7	18
8	20
9	22
10	24
11	28
12	30
13	36
14	40
15	42
16	46
17	52
18	58
19	60
20	66
21	70
22	72
23	78
24	82
25	88
26	94
27	96
28	100
29	102
30	106
31	108
32	112
33	120
34	126
35	130
36	136
37	138
38	148
39	150
40	156
41	162
42	166
43	172
44	178
45	180
46	190
47	192
48	196
49	198