A218797 - cp's OEIS frontend

A218797 Number of ways to write 2n - 1 as p + q + r with p <= q <= r and p, q, r, p^2 + q^2 + r^2 all prime.

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	1
7	2
8	1
9	2
10	0
11	1
12	2
13	2
14	1
15	3
16	2
17	3
18	1
19	2
20	1
21	1
22	2
23	2
24	2
25	1
26	2
27	1
28	2
29	4
30	1
31	3
32	2
33	2
34	2
35	2
36	2
37	2
38	4
39	3
40	3
41	3
42	2
43	4
44	4
45	3
46	0
47	2
48	1
49	1
50	1
51	1
52	2
53	2
54	3
55	2
56	4
57	4
58	3
59	3
60	2
61	3
62	4
63	2
64	2
65	3
66	2
67	1
68	3
69	3
70	1
71	2
72	2
73	5
74	1
75	4
76	2
77	2
78	1
79	1
80	6
81	3
82	1
83	5
84	1
85	1
86	5
87	4
88	1
89	4
90	1
91	2
92	6
93	2
94	4
95	2
96	2
97	2
98	1
99	4
100	4

[0, 0, 0, 1, 0, 1, 2, 1, 2, 0, 1, 2, 2, 1, 3, 2, 3, 1, 2, 1, 1, 2, 2, 2, 1, 2, 1, 2, 4, 1, 3, 2, 2, 2, 2, 2, 2, 4, 3, 3, 3, 2, 4, 4, 3, 0, 2, 1, 1, 1, 1, 2, 2, 3, 2, 4, 4, 3, 3, 2, 3, 4, 2, 2, 3, 2, 1, 3, 3, 1, 2, 2, 5, 1, 4, 2, 2, 1, 1, 6, 3, 1, 5, 1, 1, 5, 4, 1, 4, 1, 2, 6, 2, 4, 2, 2, 2, 1, 4, 4]

cp's OEIS Frontend

A218797 Number of ways to write 2n - 1 as p + q + r with p <= q <= r and p, q, r, p^2 + q^2 + r^2 all prime.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	1
7	2
8	1
9	2
10	0
11	1
12	2
13	2
14	1
15	3
16	2
17	3
18	1
19	2
20	1
21	1
22	2
23	2
24	2
25	1
26	2
27	1
28	2
29	4
30	1
31	3
32	2
33	2
34	2
35	2
36	2
37	2
38	4
39	3
40	3
41	3
42	2
43	4
44	4
45	3
46	0
47	2
48	1
49	1
50	1
51	1
52	2
53	2
54	3
55	2
56	4
57	4
58	3
59	3
60	2
61	3
62	4
63	2
64	2
65	3
66	2
67	1
68	3
69	3
70	1
71	2
72	2
73	5
74	1
75	4
76	2
77	2
78	1
79	1
80	6
81	3
82	1
83	5
84	1
85	1
86	5
87	4
88	1
89	4
90	1
91	2
92	6
93	2
94	4
95	2
96	2
97	2
98	1
99	4
100	4

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	1
7	2
8	1
9	2
10	0
11	1
12	2
13	2
14	1
15	3
16	2
17	3
18	1
19	2
20	1
21	1
22	2
23	2
24	2
25	1
26	2
27	1
28	2
29	4
30	1
31	3
32	2
33	2
34	2
35	2
36	2
37	2
38	4
39	3
40	3
41	3
42	2
43	4
44	4
45	3
46	0
47	2
48	1
49	1
50	1
51	1
52	2
53	2
54	3
55	2
56	4
57	4
58	3
59	3
60	2
61	3
62	4
63	2
64	2
65	3
66	2
67	1
68	3
69	3
70	1
71	2
72	2
73	5
74	1
75	4
76	2
77	2
78	1
79	1
80	6
81	3
82	1
83	5
84	1
85	1
86	5
87	4
88	1
89	4
90	1
91	2
92	6
93	2
94	4
95	2
96	2
97	2
98	1
99	4
100	4

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	1
7	2
8	1
9	2
10	0
11	1
12	2
13	2
14	1
15	3
16	2
17	3
18	1
19	2
20	1
21	1
22	2
23	2
24	2
25	1
26	2
27	1
28	2
29	4
30	1
31	3
32	2
33	2
34	2
35	2
36	2
37	2
38	4
39	3
40	3
41	3
42	2
43	4
44	4
45	3
46	0
47	2
48	1
49	1
50	1
51	1
52	2
53	2
54	3
55	2
56	4
57	4
58	3
59	3
60	2
61	3
62	4
63	2
64	2
65	3
66	2
67	1
68	3
69	3
70	1
71	2
72	2
73	5
74	1
75	4
76	2
77	2
78	1
79	1
80	6
81	3
82	1
83	5
84	1
85	1
86	5
87	4
88	1
89	4
90	1
91	2
92	6
93	2
94	4
95	2
96	2
97	2
98	1
99	4
100	4