A046921 - cp's OEIS frontend

A046921 Number of ways to express 2n+1 as p+2a^2; p = 1 or prime, a >= 0.

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

[1, 2, 2, 2, 2, 2, 3, 2, 1, 4, 3, 2, 3, 1, 2, 4, 2, 2, 4, 3, 2, 3, 3, 2, 4, 3, 2, 5, 1, 2, 6, 3, 1, 3, 4, 2, 5, 4, 2, 6, 3, 2, 4, 2, 3, 6, 2, 1, 4, 3, 4, 6, 4, 2, 6, 5, 2, 6, 3, 2, 5, 1, 2, 3, 5, 4, 5, 4, 1, 8, 4, 1, 6, 3, 2, 6, 2, 2, 6, 6, 1, 4, 5, 3, 7, 4, 3, 6, 2, 3, 10, 2, 3, 4, 4, 3, 3, 4, 2]

cp's OEIS Frontend

A046921 Number of ways to express 2n+1 as p+2a^2; p = 1 or prime, a >= 0.

Table of values

List of values

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

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

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