A144922 - cp's OEIS frontend

A144922 Numbers k such that k*sigma_2(k)/sigma_1(k) is an integer.

n	a(n)
1	1
2	4
3	6
4	9
5	12
6	16
7	18
8	20
9	24
10	25
11	28
12	36
13	44
14	45
15	48
16	49
17	50
18	54
19	60
20	64
21	72
22	81
23	90
24	92
25	96
26	100
27	108
28	112
29	117
30	121
31	132
32	140
33	144
34	150
35	153
36	162
37	168
38	169
39	180
40	192
41	196
42	198
43	200
44	204
45	216
46	225
47	228
48	234
49	240
50	242
51	252
52	256
53	270
54	288
55	289
56	294
57	300

[1, 4, 6, 9, 12, 16, 18, 20, 24, 25, 28, 36, 44, 45, 48, 49, 50, 54, 60, 64, 72, 81, 90, 92, 96, 100, 108, 112, 117, 121, 132, 140, 144, 150, 153, 162, 168, 169, 180, 192, 196, 198, 200, 204, 216, 225, 228, 234, 240, 242, 252, 256, 270, 288, 289, 294, 300]

cp's OEIS Frontend

A144922 Numbers k such that k*sigma_2(k)/sigma_1(k) is an integer.

Table of values

List of values

n	a(n)
1	1
2	4
3	6
4	9
5	12
6	16
7	18
8	20
9	24
10	25
11	28
12	36
13	44
14	45
15	48
16	49
17	50
18	54
19	60
20	64
21	72
22	81
23	90
24	92
25	96
26	100
27	108
28	112
29	117
30	121
31	132
32	140
33	144
34	150
35	153
36	162
37	168
38	169
39	180
40	192
41	196
42	198
43	200
44	204
45	216
46	225
47	228
48	234
49	240
50	242
51	252
52	256
53	270
54	288
55	289
56	294
57	300

n	a(n)
1	1
2	4
3	6
4	9
5	12
6	16
7	18
8	20
9	24
10	25
11	28
12	36
13	44
14	45
15	48
16	49
17	50
18	54
19	60
20	64
21	72
22	81
23	90
24	92
25	96
26	100
27	108
28	112
29	117
30	121
31	132
32	140
33	144
34	150
35	153
36	162
37	168
38	169
39	180
40	192
41	196
42	198
43	200
44	204
45	216
46	225
47	228
48	234
49	240
50	242
51	252
52	256
53	270
54	288
55	289
56	294
57	300

n	a(n)
1	1
2	4
3	6
4	9
5	12
6	16
7	18
8	20
9	24
10	25
11	28
12	36
13	44
14	45
15	48
16	49
17	50
18	54
19	60
20	64
21	72
22	81
23	90
24	92
25	96
26	100
27	108
28	112
29	117
30	121
31	132
32	140
33	144
34	150
35	153
36	162
37	168
38	169
39	180
40	192
41	196
42	198
43	200
44	204
45	216
46	225
47	228
48	234
49	240
50	242
51	252
52	256
53	270
54	288
55	289
56	294
57	300