A080401 - cp's OEIS frontend

A080401 Numbers k such that the sum of the squares of the divisors of k (A001157(k)) is squarefree.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	8
7	9
8	10
9	11
10	12
11	13
12	16
13	17
14	18
15	19
16	20
17	22
18	23
19	25
20	29
21	31
22	32
23	37
24	38
25	40
26	44
27	47
28	48
29	49
30	50
31	52
32	53
33	58
34	59
35	61
36	62
37	64
38	67
39	68
40	71
41	72
42	73
43	75
44	76
45	79
46	80
47	83
48	88
49	89
50	92
51	97
52	98
53	99
54	101
55	103
56	109
57	113
58	116
59	117
60	118
61	121
62	122
63	124
64	127
65	128
66	131
67	137

[1, 2, 3, 4, 5, 8, 9, 10, 11, 12, 13, 16, 17, 18, 19, 20, 22, 23, 25, 29, 31, 32, 37, 38, 40, 44, 47, 48, 49, 50, 52, 53, 58, 59, 61, 62, 64, 67, 68, 71, 72, 73, 75, 76, 79, 80, 83, 88, 89, 92, 97, 98, 99, 101, 103, 109, 113, 116, 117, 118, 121, 122, 124, 127, 128, 131, 137]

cp's OEIS Frontend

A080401 Numbers k such that the sum of the squares of the divisors of k (A001157(k)) is squarefree.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	8
7	9
8	10
9	11
10	12
11	13
12	16
13	17
14	18
15	19
16	20
17	22
18	23
19	25
20	29
21	31
22	32
23	37
24	38
25	40
26	44
27	47
28	48
29	49
30	50
31	52
32	53
33	58
34	59
35	61
36	62
37	64
38	67
39	68
40	71
41	72
42	73
43	75
44	76
45	79
46	80
47	83
48	88
49	89
50	92
51	97
52	98
53	99
54	101
55	103
56	109
57	113
58	116
59	117
60	118
61	121
62	122
63	124
64	127
65	128
66	131
67	137

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	8
7	9
8	10
9	11
10	12
11	13
12	16
13	17
14	18
15	19
16	20
17	22
18	23
19	25
20	29
21	31
22	32
23	37
24	38
25	40
26	44
27	47
28	48
29	49
30	50
31	52
32	53
33	58
34	59
35	61
36	62
37	64
38	67
39	68
40	71
41	72
42	73
43	75
44	76
45	79
46	80
47	83
48	88
49	89
50	92
51	97
52	98
53	99
54	101
55	103
56	109
57	113
58	116
59	117
60	118
61	121
62	122
63	124
64	127
65	128
66	131
67	137

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	8
7	9
8	10
9	11
10	12
11	13
12	16
13	17
14	18
15	19
16	20
17	22
18	23
19	25
20	29
21	31
22	32
23	37
24	38
25	40
26	44
27	47
28	48
29	49
30	50
31	52
32	53
33	58
34	59
35	61
36	62
37	64
38	67
39	68
40	71
41	72
42	73
43	75
44	76
45	79
46	80
47	83
48	88
49	89
50	92
51	97
52	98
53	99
54	101
55	103
56	109
57	113
58	116
59	117
60	118
61	121
62	122
63	124
64	127
65	128
66	131
67	137