A230494 - cp's OEIS frontend

A230494 Number of ways to write n = x^2 + y (x, y >= 0) with 2*y^2 - 1 prime.

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

[0, 1, 2, 2, 1, 2, 3, 3, 1, 2, 4, 3, 2, 2, 3, 2, 3, 3, 4, 2, 2, 5, 2, 3, 3, 4, 3, 3, 4, 1, 3, 2, 3, 3, 2, 2, 3, 5, 3, 5, 2, 5, 6, 3, 3, 5, 5, 1, 4, 6, 4, 4, 5, 4, 3, 3, 4, 3, 5, 4, 4, 3, 4, 5, 3, 5, 4, 5, 1, 5, 4, 4, 4, 5, 4, 1, 6, 3, 3, 3, 5, 4, 2, 3, 8, 3, 4, 6, 6, 2, 4, 7, 1, 4, 4, 5, 1, 6, 5, 3]

cp's OEIS Frontend

A230494 Number of ways to write n = x^2 + y (x, y >= 0) with 2*y^2 - 1 prime.

Table of values

List of values

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

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

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