A000203 - cp's OEIS frontend

A000203 a(n) = sigma(n), the sum of the divisors of n. Also called sigma_1(n).

n	a(n)
1	1
2	3
3	4
4	7
5	6
6	12
7	8
8	15
9	13
10	18
11	12
12	28
13	14
14	24
15	24
16	31
17	18
18	39
19	20
20	42
21	32
22	36
23	24
24	60
25	31
26	42
27	40
28	56
29	30
30	72
31	32
32	63
33	48
34	54
35	48
36	91
37	38
38	60
39	56
40	90
41	42
42	96
43	44
44	84
45	78
46	72
47	48
48	124
49	57
50	93
51	72
52	98
53	54
54	120
55	72
56	120
57	80
58	90
59	60
60	168
61	62
62	96
63	104
64	127
65	84
66	144
67	68
68	126
69	96
70	144

[1, 3, 4, 7, 6, 12, 8, 15, 13, 18, 12, 28, 14, 24, 24, 31, 18, 39, 20, 42, 32, 36, 24, 60, 31, 42, 40, 56, 30, 72, 32, 63, 48, 54, 48, 91, 38, 60, 56, 90, 42, 96, 44, 84, 78, 72, 48, 124, 57, 93, 72, 98, 54, 120, 72, 120, 80, 90, 60, 168, 62, 96, 104, 127, 84, 144, 68, 126, 96, 144]

cp's OEIS Frontend

A000203 a(n) = sigma(n), the sum of the divisors of n. Also called sigma_1(n).

Table of values

List of values

n	a(n)
1	1
2	3
3	4
4	7
5	6
6	12
7	8
8	15
9	13
10	18
11	12
12	28
13	14
14	24
15	24
16	31
17	18
18	39
19	20
20	42
21	32
22	36
23	24
24	60
25	31
26	42
27	40
28	56
29	30
30	72
31	32
32	63
33	48
34	54
35	48
36	91
37	38
38	60
39	56
40	90
41	42
42	96
43	44
44	84
45	78
46	72
47	48
48	124
49	57
50	93
51	72
52	98
53	54
54	120
55	72
56	120
57	80
58	90
59	60
60	168
61	62
62	96
63	104
64	127
65	84
66	144
67	68
68	126
69	96
70	144

n	a(n)
1	1
2	3
3	4
4	7
5	6
6	12
7	8
8	15
9	13
10	18
11	12
12	28
13	14
14	24
15	24
16	31
17	18
18	39
19	20
20	42
21	32
22	36
23	24
24	60
25	31
26	42
27	40
28	56
29	30
30	72
31	32
32	63
33	48
34	54
35	48
36	91
37	38
38	60
39	56
40	90
41	42
42	96
43	44
44	84
45	78
46	72
47	48
48	124
49	57
50	93
51	72
52	98
53	54
54	120
55	72
56	120
57	80
58	90
59	60
60	168
61	62
62	96
63	104
64	127
65	84
66	144
67	68
68	126
69	96
70	144

n	a(n)
1	1
2	3
3	4
4	7
5	6
6	12
7	8
8	15
9	13
10	18
11	12
12	28
13	14
14	24
15	24
16	31
17	18
18	39
19	20
20	42
21	32
22	36
23	24
24	60
25	31
26	42
27	40
28	56
29	30
30	72
31	32
32	63
33	48
34	54
35	48
36	91
37	38
38	60
39	56
40	90
41	42
42	96
43	44
44	84
45	78
46	72
47	48
48	124
49	57
50	93
51	72
52	98
53	54
54	120
55	72
56	120
57	80
58	90
59	60
60	168
61	62
62	96
63	104
64	127
65	84
66	144
67	68
68	126
69	96
70	144