A020486 - cp's OEIS frontend

A020486 Average of squares of divisors is an integer: numbers k such that sigma_0(k) divides sigma_2(k).

n	a(n)
1	1
2	3
3	4
4	5
5	7
6	11
7	12
8	13
9	15
10	17
11	19
12	20
13	21
14	23
15	25
16	27
17	28
18	29
19	31
20	33
21	35
22	37
23	39
24	41
25	43
26	44
27	47
28	48
29	49
30	51
31	52
32	53
33	55
34	57
35	59
36	60
37	61
38	65
39	67
40	68
41	69
42	71
43	73
44	75
45	76
46	77
47	79
48	83
49	84
50	85
51	87
52	89
53	91
54	92
55	93
56	95
57	97
58	100
59	101
60	103
61	105
62	107
63	108
64	109
65	111
66	112
67	113
68	115
69	116

[1, 3, 4, 5, 7, 11, 12, 13, 15, 17, 19, 20, 21, 23, 25, 27, 28, 29, 31, 33, 35, 37, 39, 41, 43, 44, 47, 48, 49, 51, 52, 53, 55, 57, 59, 60, 61, 65, 67, 68, 69, 71, 73, 75, 76, 77, 79, 83, 84, 85, 87, 89, 91, 92, 93, 95, 97, 100, 101, 103, 105, 107, 108, 109, 111, 112, 113, 115, 116]

cp's OEIS Frontend

A020486 Average of squares of divisors is an integer: numbers k such that sigma_0(k) divides sigma_2(k).

Table of values

List of values

n	a(n)
1	1
2	3
3	4
4	5
5	7
6	11
7	12
8	13
9	15
10	17
11	19
12	20
13	21
14	23
15	25
16	27
17	28
18	29
19	31
20	33
21	35
22	37
23	39
24	41
25	43
26	44
27	47
28	48
29	49
30	51
31	52
32	53
33	55
34	57
35	59
36	60
37	61
38	65
39	67
40	68
41	69
42	71
43	73
44	75
45	76
46	77
47	79
48	83
49	84
50	85
51	87
52	89
53	91
54	92
55	93
56	95
57	97
58	100
59	101
60	103
61	105
62	107
63	108
64	109
65	111
66	112
67	113
68	115
69	116

n	a(n)
1	1
2	3
3	4
4	5
5	7
6	11
7	12
8	13
9	15
10	17
11	19
12	20
13	21
14	23
15	25
16	27
17	28
18	29
19	31
20	33
21	35
22	37
23	39
24	41
25	43
26	44
27	47
28	48
29	49
30	51
31	52
32	53
33	55
34	57
35	59
36	60
37	61
38	65
39	67
40	68
41	69
42	71
43	73
44	75
45	76
46	77
47	79
48	83
49	84
50	85
51	87
52	89
53	91
54	92
55	93
56	95
57	97
58	100
59	101
60	103
61	105
62	107
63	108
64	109
65	111
66	112
67	113
68	115
69	116

n	a(n)
1	1
2	3
3	4
4	5
5	7
6	11
7	12
8	13
9	15
10	17
11	19
12	20
13	21
14	23
15	25
16	27
17	28
18	29
19	31
20	33
21	35
22	37
23	39
24	41
25	43
26	44
27	47
28	48
29	49
30	51
31	52
32	53
33	55
34	57
35	59
36	60
37	61
38	65
39	67
40	68
41	69
42	71
43	73
44	75
45	76
46	77
47	79
48	83
49	84
50	85
51	87
52	89
53	91
54	92
55	93
56	95
57	97
58	100
59	101
60	103
61	105
62	107
63	108
64	109
65	111
66	112
67	113
68	115
69	116