A049990 - cp's OEIS frontend

A049990 a(n) is the number of arithmetic progressions of 2 or more positive integers, nondecreasing with sum n.

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	6
7	4
8	6
9	8
10	8
11	6
12	13
13	7
14	10
15	15
16	12
17	9
18	19
19	10
20	16
21	20
22	15
23	12
24	26
25	16
26	17
27	25
28	21
29	15
30	34
31	16
32	22
33	30
34	22
35	24
36	40
37	19
38	24
39	35
40	32
41	21
42	45
43	22
44	30
45	47
46	29
47	24
48	51
49	28
50	37
51	46
52	35
53	27
54	56
55	36
56	40
57	51
58	36
59	30
60	70
61	31
62	38
63	61
64	43

[0, 1, 2, 3, 3, 6, 4, 6, 8, 8, 6, 13, 7, 10, 15, 12, 9, 19, 10, 16, 20, 15, 12, 26, 16, 17, 25, 21, 15, 34, 16, 22, 30, 22, 24, 40, 19, 24, 35, 32, 21, 45, 22, 30, 47, 29, 24, 51, 28, 37, 46, 35, 27, 56, 36, 40, 51, 36, 30, 70, 31, 38, 61, 43]

cp's OEIS Frontend

A049990 a(n) is the number of arithmetic progressions of 2 or more positive integers, nondecreasing with sum n.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	6
7	4
8	6
9	8
10	8
11	6
12	13
13	7
14	10
15	15
16	12
17	9
18	19
19	10
20	16
21	20
22	15
23	12
24	26
25	16
26	17
27	25
28	21
29	15
30	34
31	16
32	22
33	30
34	22
35	24
36	40
37	19
38	24
39	35
40	32
41	21
42	45
43	22
44	30
45	47
46	29
47	24
48	51
49	28
50	37
51	46
52	35
53	27
54	56
55	36
56	40
57	51
58	36
59	30
60	70
61	31
62	38
63	61
64	43

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	6
7	4
8	6
9	8
10	8
11	6
12	13
13	7
14	10
15	15
16	12
17	9
18	19
19	10
20	16
21	20
22	15
23	12
24	26
25	16
26	17
27	25
28	21
29	15
30	34
31	16
32	22
33	30
34	22
35	24
36	40
37	19
38	24
39	35
40	32
41	21
42	45
43	22
44	30
45	47
46	29
47	24
48	51
49	28
50	37
51	46
52	35
53	27
54	56
55	36
56	40
57	51
58	36
59	30
60	70
61	31
62	38
63	61
64	43

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	6
7	4
8	6
9	8
10	8
11	6
12	13
13	7
14	10
15	15
16	12
17	9
18	19
19	10
20	16
21	20
22	15
23	12
24	26
25	16
26	17
27	25
28	21
29	15
30	34
31	16
32	22
33	30
34	22
35	24
36	40
37	19
38	24
39	35
40	32
41	21
42	45
43	22
44	30
45	47
46	29
47	24
48	51
49	28
50	37
51	46
52	35
53	27
54	56
55	36
56	40
57	51
58	36
59	30
60	70
61	31
62	38
63	61
64	43