A065300 - cp's OEIS frontend

A065300 Numbers k such that the sum of divisors of k is a squarefree number.

n	a(n)
1	1
2	2
3	4
4	5
5	8
6	9
7	13
8	16
9	18
10	20
11	25
12	26
13	29
14	36
15	37
16	41
17	45
18	49
19	50
20	61
21	64
22	72
23	73
24	74
25	80
26	100
27	101
28	104
29	109
30	113
31	116
32	117
33	121
34	122
35	128
36	137
37	144
38	146
39	148
40	157
41	169
42	173
43	180
44	181
45	193
46	196
47	200
48	208
49	218
50	225
51	229
52	234
53	242
54	244
55	256
56	257
57	261
58	277
59	281

[1, 2, 4, 5, 8, 9, 13, 16, 18, 20, 25, 26, 29, 36, 37, 41, 45, 49, 50, 61, 64, 72, 73, 74, 80, 100, 101, 104, 109, 113, 116, 117, 121, 122, 128, 137, 144, 146, 148, 157, 169, 173, 180, 181, 193, 196, 200, 208, 218, 225, 229, 234, 242, 244, 256, 257, 261, 277, 281]

cp's OEIS Frontend

A065300 Numbers k such that the sum of divisors of k is a squarefree number.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	5
5	8
6	9
7	13
8	16
9	18
10	20
11	25
12	26
13	29
14	36
15	37
16	41
17	45
18	49
19	50
20	61
21	64
22	72
23	73
24	74
25	80
26	100
27	101
28	104
29	109
30	113
31	116
32	117
33	121
34	122
35	128
36	137
37	144
38	146
39	148
40	157
41	169
42	173
43	180
44	181
45	193
46	196
47	200
48	208
49	218
50	225
51	229
52	234
53	242
54	244
55	256
56	257
57	261
58	277
59	281

n	a(n)
1	1
2	2
3	4
4	5
5	8
6	9
7	13
8	16
9	18
10	20
11	25
12	26
13	29
14	36
15	37
16	41
17	45
18	49
19	50
20	61
21	64
22	72
23	73
24	74
25	80
26	100
27	101
28	104
29	109
30	113
31	116
32	117
33	121
34	122
35	128
36	137
37	144
38	146
39	148
40	157
41	169
42	173
43	180
44	181
45	193
46	196
47	200
48	208
49	218
50	225
51	229
52	234
53	242
54	244
55	256
56	257
57	261
58	277
59	281

n	a(n)
1	1
2	2
3	4
4	5
5	8
6	9
7	13
8	16
9	18
10	20
11	25
12	26
13	29
14	36
15	37
16	41
17	45
18	49
19	50
20	61
21	64
22	72
23	73
24	74
25	80
26	100
27	101
28	104
29	109
30	113
31	116
32	117
33	121
34	122
35	128
36	137
37	144
38	146
39	148
40	157
41	169
42	173
43	180
44	181
45	193
46	196
47	200
48	208
49	218
50	225
51	229
52	234
53	242
54	244
55	256
56	257
57	261
58	277
59	281