A270928 - cp's OEIS frontend

A270928 Number of ways to write n = x(x-1)/2 + y(y-1)/2 + z*(z-1)/2, where 0 < x <= y <= z, and one of x, y, z is prime.

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

[1, 1, 2, 1, 1, 1, 2, 1, 2, 2, 1, 2, 2, 1, 1, 3, 2, 1, 2, 1, 3, 3, 2, 2, 2, 2, 2, 2, 1, 3, 4, 2, 2, 2, 2, 1, 4, 2, 3, 2, 2, 3, 2, 2, 2, 4, 2, 3, 3, 1, 2, 5, 1, 2, 3, 3, 4, 3, 3, 1, 5, 1, 3, 2, 3, 3, 5, 2, 2, 4]

cp's OEIS Frontend

A270928 Number of ways to write n = x(x-1)/2 + y(y-1)/2 + z*(z-1)/2, where 0 < x <= y <= z, and one of x, y, z is prime.

Table of values

List of values

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

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

cp's OEIS Frontend

A270928 Number of ways to write n = x*(x-1)/2 + y*(y-1)/2 + z*(z-1)/2, where 0 < x <= y <= z, and one of x, y, z is prime.

Table of values

List of values

A270928 Number of ways to write n = x(x-1)/2 + y(y-1)/2 + z*(z-1)/2, where 0 < x <= y <= z, and one of x, y, z is prime.

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