A066839 - cp's OEIS frontend

A066839 a(n) = sum of positive divisors k of n with k <= sqrt(n).

n	a(n)
1	1
2	1
3	1
4	3
5	1
6	3
7	1
8	3
9	4
10	3
11	1
12	6
13	1
14	3
15	4
16	7
17	1
18	6
19	1
20	7
21	4
22	3
23	1
24	10
25	6
26	3
27	4
28	7
29	1
30	11
31	1
32	7
33	4
34	3
35	6
36	16
37	1
38	3
39	4
40	12
41	1
42	12
43	1
44	7
45	9
46	3
47	1
48	16
49	8
50	8
51	4
52	7
53	1
54	12
55	6
56	14
57	4
58	3
59	1
60	21
61	1
62	3
63	11
64	15
65	6
66	12
67	1
68	7
69	4
70	15
71	1
72	24
73	1
74	3
75	9
76	7
77	8
78	12
79	1
80	20
81	13
82	3
83	1
84	23
85	6
86	3
87	4
88	15
89	1
90	26
91	8
92	7
93	4
94	3

[1, 1, 1, 3, 1, 3, 1, 3, 4, 3, 1, 6, 1, 3, 4, 7, 1, 6, 1, 7, 4, 3, 1, 10, 6, 3, 4, 7, 1, 11, 1, 7, 4, 3, 6, 16, 1, 3, 4, 12, 1, 12, 1, 7, 9, 3, 1, 16, 8, 8, 4, 7, 1, 12, 6, 14, 4, 3, 1, 21, 1, 3, 11, 15, 6, 12, 1, 7, 4, 15, 1, 24, 1, 3, 9, 7, 8, 12, 1, 20, 13, 3, 1, 23, 6, 3, 4, 15, 1, 26, 8, 7, 4, 3]

cp's OEIS Frontend

A066839 a(n) = sum of positive divisors k of n with k <= sqrt(n).

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	3
5	1
6	3
7	1
8	3
9	4
10	3
11	1
12	6
13	1
14	3
15	4
16	7
17	1
18	6
19	1
20	7
21	4
22	3
23	1
24	10
25	6
26	3
27	4
28	7
29	1
30	11
31	1
32	7
33	4
34	3
35	6
36	16
37	1
38	3
39	4
40	12
41	1
42	12
43	1
44	7
45	9
46	3
47	1
48	16
49	8
50	8
51	4
52	7
53	1
54	12
55	6
56	14
57	4
58	3
59	1
60	21
61	1
62	3
63	11
64	15
65	6
66	12
67	1
68	7
69	4
70	15
71	1
72	24
73	1
74	3
75	9
76	7
77	8
78	12
79	1
80	20
81	13
82	3
83	1
84	23
85	6
86	3
87	4
88	15
89	1
90	26
91	8
92	7
93	4
94	3

n	a(n)
1	1
2	1
3	1
4	3
5	1
6	3
7	1
8	3
9	4
10	3
11	1
12	6
13	1
14	3
15	4
16	7
17	1
18	6
19	1
20	7
21	4
22	3
23	1
24	10
25	6
26	3
27	4
28	7
29	1
30	11
31	1
32	7
33	4
34	3
35	6
36	16
37	1
38	3
39	4
40	12
41	1
42	12
43	1
44	7
45	9
46	3
47	1
48	16
49	8
50	8
51	4
52	7
53	1
54	12
55	6
56	14
57	4
58	3
59	1
60	21
61	1
62	3
63	11
64	15
65	6
66	12
67	1
68	7
69	4
70	15
71	1
72	24
73	1
74	3
75	9
76	7
77	8
78	12
79	1
80	20
81	13
82	3
83	1
84	23
85	6
86	3
87	4
88	15
89	1
90	26
91	8
92	7
93	4
94	3

n	a(n)
1	1
2	1
3	1
4	3
5	1
6	3
7	1
8	3
9	4
10	3
11	1
12	6
13	1
14	3
15	4
16	7
17	1
18	6
19	1
20	7
21	4
22	3
23	1
24	10
25	6
26	3
27	4
28	7
29	1
30	11
31	1
32	7
33	4
34	3
35	6
36	16
37	1
38	3
39	4
40	12
41	1
42	12
43	1
44	7
45	9
46	3
47	1
48	16
49	8
50	8
51	4
52	7
53	1
54	12
55	6
56	14
57	4
58	3
59	1
60	21
61	1
62	3
63	11
64	15
65	6
66	12
67	1
68	7
69	4
70	15
71	1
72	24
73	1
74	3
75	9
76	7
77	8
78	12
79	1
80	20
81	13
82	3
83	1
84	23
85	6
86	3
87	4
88	15
89	1
90	26
91	8
92	7
93	4
94	3