A002973 - cp's OEIS frontend

A002973 a(n) is half of the even member of {x,y}, where x^2 + y^2 is the n-th prime of the form 4i+1.

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

[1, 1, 2, 1, 3, 2, 1, 3, 4, 4, 2, 5, 5, 4, 2, 5, 3, 1, 5, 6, 7, 1, 4, 2, 8, 5, 7, 8, 1, 6, 7, 8, 9, 4, 9, 5, 3, 10, 10, 7, 6, 10, 2, 5, 11, 10, 5, 7, 10, 12, 4, 12, 9, 8, 2, 11, 3, 6, 13, 13, 11, 1, 13, 10, 6, 11, 13, 14, 7, 5, 9, 2, 3, 8, 10, 12, 5, 14, 2, 3, 14, 11, 15, 16, 16, 5, 15, 1, 8, 11]

cp's OEIS Frontend

A002973 a(n) is half of the even member of {x,y}, where x^2 + y^2 is the n-th prime of the form 4i+1.

Table of values

List of values

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

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

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