A049987 - cp's OEIS frontend

A049987 a(n) is the number of arithmetic progressions of 4 or more positive integers, strictly increasing with sum <= n.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	1
11	1
12	1
13	1
14	2
15	3
16	4
17	4
18	5
19	5
20	7
21	8
22	10
23	10
24	11
25	13
26	15
27	16
28	19
29	19
30	23
31	23
32	25
33	26
34	29
35	33
36	37
37	37
38	40
39	41
40	47
41	47
42	52
43	52
44	56
45	62
46	66
47	66
48	70
49	72
50	80
51	82
52	87
53	87
54	93
55	99
56	105
57	107
58	112
59	112
60	123
61	123
62	128
63	133
64	139
65	146
66	154
67	154
68	160
69	162
70	177
71	177
72	186
73	186
74	192
75	202

[0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 3, 4, 4, 5, 5, 7, 8, 10, 10, 11, 13, 15, 16, 19, 19, 23, 23, 25, 26, 29, 33, 37, 37, 40, 41, 47, 47, 52, 52, 56, 62, 66, 66, 70, 72, 80, 82, 87, 87, 93, 99, 105, 107, 112, 112, 123, 123, 128, 133, 139, 146, 154, 154, 160, 162, 177, 177, 186, 186, 192, 202]

cp's OEIS Frontend

A049987 a(n) is the number of arithmetic progressions of 4 or more positive integers, strictly increasing with sum <= n.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	1
11	1
12	1
13	1
14	2
15	3
16	4
17	4
18	5
19	5
20	7
21	8
22	10
23	10
24	11
25	13
26	15
27	16
28	19
29	19
30	23
31	23
32	25
33	26
34	29
35	33
36	37
37	37
38	40
39	41
40	47
41	47
42	52
43	52
44	56
45	62
46	66
47	66
48	70
49	72
50	80
51	82
52	87
53	87
54	93
55	99
56	105
57	107
58	112
59	112
60	123
61	123
62	128
63	133
64	139
65	146
66	154
67	154
68	160
69	162
70	177
71	177
72	186
73	186
74	192
75	202

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	1
11	1
12	1
13	1
14	2
15	3
16	4
17	4
18	5
19	5
20	7
21	8
22	10
23	10
24	11
25	13
26	15
27	16
28	19
29	19
30	23
31	23
32	25
33	26
34	29
35	33
36	37
37	37
38	40
39	41
40	47
41	47
42	52
43	52
44	56
45	62
46	66
47	66
48	70
49	72
50	80
51	82
52	87
53	87
54	93
55	99
56	105
57	107
58	112
59	112
60	123
61	123
62	128
63	133
64	139
65	146
66	154
67	154
68	160
69	162
70	177
71	177
72	186
73	186
74	192
75	202

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	1
11	1
12	1
13	1
14	2
15	3
16	4
17	4
18	5
19	5
20	7
21	8
22	10
23	10
24	11
25	13
26	15
27	16
28	19
29	19
30	23
31	23
32	25
33	26
34	29
35	33
36	37
37	37
38	40
39	41
40	47
41	47
42	52
43	52
44	56
45	62
46	66
47	66
48	70
49	72
50	80
51	82
52	87
53	87
54	93
55	99
56	105
57	107
58	112
59	112
60	123
61	123
62	128
63	133
64	139
65	146
66	154
67	154
68	160
69	162
70	177
71	177
72	186
73	186
74	192
75	202