A385584 - cp's OEIS frontend

A385584 a(n) is the number of pairs (p, t) such that p is a pyramidal number, t is a triangular number, p + t <= n and t <= p.

n	a(n)
0	1
1	2
2	3
3	3
4	4
5	5
6	5
7	6
8	6
9	6
10	7
11	8
12	8
13	9
14	9
15	9
16	10
17	10
18	10
19	10
20	12
21	13
22	13
23	14
24	14
25	14
26	15
27	15
28	15
29	15
30	16
31	16
32	16
33	16
34	16
35	18
36	19
37	19
38	20
39	20
40	20
41	21
42	21
43	21
44	21
45	22
46	22
47	22
48	22
49	22
50	23
51	23
52	23
53	23
54	23
55	23
56	25
57	26
58	26
59	27
60	27
61	27
62	28
63	29
64	29
65	29
66	30
67	30
68	30
69	30
70	30
71	31
72	31
73	31

[1, 2, 3, 3, 4, 5, 5, 6, 6, 6, 7, 8, 8, 9, 9, 9, 10, 10, 10, 10, 12, 13, 13, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 16, 18, 19, 19, 20, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 25, 26, 26, 27, 27, 27, 28, 29, 29, 29, 30, 30, 30, 30, 30, 31, 31, 31]

cp's OEIS Frontend

A385584 a(n) is the number of pairs (p, t) such that p is a pyramidal number, t is a triangular number, p + t <= n and t <= p.

Table of values

List of values

n	a(n)
0	1
1	2
2	3
3	3
4	4
5	5
6	5
7	6
8	6
9	6
10	7
11	8
12	8
13	9
14	9
15	9
16	10
17	10
18	10
19	10
20	12
21	13
22	13
23	14
24	14
25	14
26	15
27	15
28	15
29	15
30	16
31	16
32	16
33	16
34	16
35	18
36	19
37	19
38	20
39	20
40	20
41	21
42	21
43	21
44	21
45	22
46	22
47	22
48	22
49	22
50	23
51	23
52	23
53	23
54	23
55	23
56	25
57	26
58	26
59	27
60	27
61	27
62	28
63	29
64	29
65	29
66	30
67	30
68	30
69	30
70	30
71	31
72	31
73	31

n	a(n)
0	1
1	2
2	3
3	3
4	4
5	5
6	5
7	6
8	6
9	6
10	7
11	8
12	8
13	9
14	9
15	9
16	10
17	10
18	10
19	10
20	12
21	13
22	13
23	14
24	14
25	14
26	15
27	15
28	15
29	15
30	16
31	16
32	16
33	16
34	16
35	18
36	19
37	19
38	20
39	20
40	20
41	21
42	21
43	21
44	21
45	22
46	22
47	22
48	22
49	22
50	23
51	23
52	23
53	23
54	23
55	23
56	25
57	26
58	26
59	27
60	27
61	27
62	28
63	29
64	29
65	29
66	30
67	30
68	30
69	30
70	30
71	31
72	31
73	31

n	a(n)
0	1
1	2
2	3
3	3
4	4
5	5
6	5
7	6
8	6
9	6
10	7
11	8
12	8
13	9
14	9
15	9
16	10
17	10
18	10
19	10
20	12
21	13
22	13
23	14
24	14
25	14
26	15
27	15
28	15
29	15
30	16
31	16
32	16
33	16
34	16
35	18
36	19
37	19
38	20
39	20
40	20
41	21
42	21
43	21
44	21
45	22
46	22
47	22
48	22
49	22
50	23
51	23
52	23
53	23
54	23
55	23
56	25
57	26
58	26
59	27
60	27
61	27
62	28
63	29
64	29
65	29
66	30
67	30
68	30
69	30
70	30
71	31
72	31
73	31