A143539 - cp's OEIS frontend

A143539 Number of ways to express 2n-1 as p+2a^2; p prime, a > 0.

n	a(n)
1	0
2	0
3	1
4	1
5	1
6	1
7	2
8	2
9	0
10	2
11	3
12	1
13	3
14	1
15	1
16	3
17	1
18	2
19	3
20	3
21	1
22	2
23	3
24	1
25	4
26	2
27	1
28	5
29	1
30	1
31	5
32	3
33	1
34	2
35	4
36	1
37	3
38	4
39	2
40	5
41	3
42	1
43	4
44	2
45	2
46	6
47	2
48	1
49	3
50	2
51	3
52	5
53	4
54	1
55	5
56	5
57	1
58	6
59	3
60	2
61	5
62	1
63	2
64	2
65	4
66	3
67	5
68	4
69	0
70	7
71	4
72	1
73	6
74	3
75	1
76	5
77	2
78	2
79	5
80	6
81	1
82	2
83	5
84	2
85	7
86	4
87	2
88	6
89	2
90	2
91	9
92	2
93	3
94	4
95	4
96	2
97	2
98	4
99	1
100	9
101	5
102	3
103	5
104	5
105	3

[0, 0, 1, 1, 1, 1, 2, 2, 0, 2, 3, 1, 3, 1, 1, 3, 1, 2, 3, 3, 1, 2, 3, 1, 4, 2, 1, 5, 1, 1, 5, 3, 1, 2, 4, 1, 3, 4, 2, 5, 3, 1, 4, 2, 2, 6, 2, 1, 3, 2, 3, 5, 4, 1, 5, 5, 1, 6, 3, 2, 5, 1, 2, 2, 4, 3, 5, 4, 0, 7, 4, 1, 6, 3, 1, 5, 2, 2, 5, 6, 1, 2, 5, 2, 7, 4, 2, 6, 2, 2, 9, 2, 3, 4, 4, 2, 2, 4, 1, 9, 5, 3, 5, 5, 3]

cp's OEIS Frontend

A143539 Number of ways to express 2n-1 as p+2a^2; p prime, a > 0.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	1
5	1
6	1
7	2
8	2
9	0
10	2
11	3
12	1
13	3
14	1
15	1
16	3
17	1
18	2
19	3
20	3
21	1
22	2
23	3
24	1
25	4
26	2
27	1
28	5
29	1
30	1
31	5
32	3
33	1
34	2
35	4
36	1
37	3
38	4
39	2
40	5
41	3
42	1
43	4
44	2
45	2
46	6
47	2
48	1
49	3
50	2
51	3
52	5
53	4
54	1
55	5
56	5
57	1
58	6
59	3
60	2
61	5
62	1
63	2
64	2
65	4
66	3
67	5
68	4
69	0
70	7
71	4
72	1
73	6
74	3
75	1
76	5
77	2
78	2
79	5
80	6
81	1
82	2
83	5
84	2
85	7
86	4
87	2
88	6
89	2
90	2
91	9
92	2
93	3
94	4
95	4
96	2
97	2
98	4
99	1
100	9
101	5
102	3
103	5
104	5
105	3

n	a(n)
1	0
2	0
3	1
4	1
5	1
6	1
7	2
8	2
9	0
10	2
11	3
12	1
13	3
14	1
15	1
16	3
17	1
18	2
19	3
20	3
21	1
22	2
23	3
24	1
25	4
26	2
27	1
28	5
29	1
30	1
31	5
32	3
33	1
34	2
35	4
36	1
37	3
38	4
39	2
40	5
41	3
42	1
43	4
44	2
45	2
46	6
47	2
48	1
49	3
50	2
51	3
52	5
53	4
54	1
55	5
56	5
57	1
58	6
59	3
60	2
61	5
62	1
63	2
64	2
65	4
66	3
67	5
68	4
69	0
70	7
71	4
72	1
73	6
74	3
75	1
76	5
77	2
78	2
79	5
80	6
81	1
82	2
83	5
84	2
85	7
86	4
87	2
88	6
89	2
90	2
91	9
92	2
93	3
94	4
95	4
96	2
97	2
98	4
99	1
100	9
101	5
102	3
103	5
104	5
105	3

n	a(n)
1	0
2	0
3	1
4	1
5	1
6	1
7	2
8	2
9	0
10	2
11	3
12	1
13	3
14	1
15	1
16	3
17	1
18	2
19	3
20	3
21	1
22	2
23	3
24	1
25	4
26	2
27	1
28	5
29	1
30	1
31	5
32	3
33	1
34	2
35	4
36	1
37	3
38	4
39	2
40	5
41	3
42	1
43	4
44	2
45	2
46	6
47	2
48	1
49	3
50	2
51	3
52	5
53	4
54	1
55	5
56	5
57	1
58	6
59	3
60	2
61	5
62	1
63	2
64	2
65	4
66	3
67	5
68	4
69	0
70	7
71	4
72	1
73	6
74	3
75	1
76	5
77	2
78	2
79	5
80	6
81	1
82	2
83	5
84	2
85	7
86	4
87	2
88	6
89	2
90	2
91	9
92	2
93	3
94	4
95	4
96	2
97	2
98	4
99	1
100	9
101	5
102	3
103	5
104	5
105	3