A058267 - cp's OEIS frontend

A058267 An approximation to sigma_{1/2}(n): round( Sum_{ d divides n } sqrt(d) ).

n	a(n)
1	1
2	2
3	3
4	4
5	3
6	7
7	4
8	7
9	6
10	8
11	4
12	12
13	5
14	9
15	9
16	11
17	5
18	14
19	5
20	14
21	10
22	10
23	6
24	20
25	8
26	11
27	11
28	16
29	6
30	21
31	7
32	17
33	12
34	12
35	12
36	25
37	7
38	13
39	13
40	23
41	7
42	24
43	8
44	19
45	19
46	14
47	8
48	31
49	11
50	20
51	14
52	20
53	8
54	26
55	14
56	26
57	15
58	15
59	9
60	39
61	9
62	16
63	21
64	25
65	15
66	28
67	9
68	23
69	16
70	28
71	9
72	42
73	10

[1, 2, 3, 4, 3, 7, 4, 7, 6, 8, 4, 12, 5, 9, 9, 11, 5, 14, 5, 14, 10, 10, 6, 20, 8, 11, 11, 16, 6, 21, 7, 17, 12, 12, 12, 25, 7, 13, 13, 23, 7, 24, 8, 19, 19, 14, 8, 31, 11, 20, 14, 20, 8, 26, 14, 26, 15, 15, 9, 39, 9, 16, 21, 25, 15, 28, 9, 23, 16, 28, 9, 42, 10]

cp's OEIS Frontend

A058267 An approximation to sigma_{1/2}(n): round( Sum_{ d divides n } sqrt(d) ).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	3
6	7
7	4
8	7
9	6
10	8
11	4
12	12
13	5
14	9
15	9
16	11
17	5
18	14
19	5
20	14
21	10
22	10
23	6
24	20
25	8
26	11
27	11
28	16
29	6
30	21
31	7
32	17
33	12
34	12
35	12
36	25
37	7
38	13
39	13
40	23
41	7
42	24
43	8
44	19
45	19
46	14
47	8
48	31
49	11
50	20
51	14
52	20
53	8
54	26
55	14
56	26
57	15
58	15
59	9
60	39
61	9
62	16
63	21
64	25
65	15
66	28
67	9
68	23
69	16
70	28
71	9
72	42
73	10

n	a(n)
1	1
2	2
3	3
4	4
5	3
6	7
7	4
8	7
9	6
10	8
11	4
12	12
13	5
14	9
15	9
16	11
17	5
18	14
19	5
20	14
21	10
22	10
23	6
24	20
25	8
26	11
27	11
28	16
29	6
30	21
31	7
32	17
33	12
34	12
35	12
36	25
37	7
38	13
39	13
40	23
41	7
42	24
43	8
44	19
45	19
46	14
47	8
48	31
49	11
50	20
51	14
52	20
53	8
54	26
55	14
56	26
57	15
58	15
59	9
60	39
61	9
62	16
63	21
64	25
65	15
66	28
67	9
68	23
69	16
70	28
71	9
72	42
73	10

n	a(n)
1	1
2	2
3	3
4	4
5	3
6	7
7	4
8	7
9	6
10	8
11	4
12	12
13	5
14	9
15	9
16	11
17	5
18	14
19	5
20	14
21	10
22	10
23	6
24	20
25	8
26	11
27	11
28	16
29	6
30	21
31	7
32	17
33	12
34	12
35	12
36	25
37	7
38	13
39	13
40	23
41	7
42	24
43	8
44	19
45	19
46	14
47	8
48	31
49	11
50	20
51	14
52	20
53	8
54	26
55	14
56	26
57	15
58	15
59	9
60	39
61	9
62	16
63	21
64	25
65	15
66	28
67	9
68	23
69	16
70	28
71	9
72	42
73	10