A002972 - cp's OEIS frontend

A002972 a(n) is the odd 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	3
3	1
4	5
5	1
6	5
7	7
8	5
9	3
10	5
11	9
12	1
13	3
14	7
15	11
16	7
17	11
18	13
19	9
20	7
21	1
22	15
23	13
24	15
25	1
26	13
27	9
28	5
29	17
30	13
31	11
32	9
33	5
34	17
35	7
36	17
37	19
38	1
39	3
40	15
41	17
42	7
43	21
44	19
45	5
46	11
47	21
48	19
49	13
50	1
51	23
52	5
53	17
54	19
55	25
56	13
57	25
58	23
59	1
60	5
61	15
62	27
63	9
64	19
65	25
66	17
67	11
68	5
69	25
70	27
71	23
72	29
73	29
74	25
75	23
76	19
77	29
78	13
79	31
80	31

[1, 3, 1, 5, 1, 5, 7, 5, 3, 5, 9, 1, 3, 7, 11, 7, 11, 13, 9, 7, 1, 15, 13, 15, 1, 13, 9, 5, 17, 13, 11, 9, 5, 17, 7, 17, 19, 1, 3, 15, 17, 7, 21, 19, 5, 11, 21, 19, 13, 1, 23, 5, 17, 19, 25, 13, 25, 23, 1, 5, 15, 27, 9, 19, 25, 17, 11, 5, 25, 27, 23, 29, 29, 25, 23, 19, 29, 13, 31, 31]

cp's OEIS Frontend

A002972 a(n) is the odd 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	3
3	1
4	5
5	1
6	5
7	7
8	5
9	3
10	5
11	9
12	1
13	3
14	7
15	11
16	7
17	11
18	13
19	9
20	7
21	1
22	15
23	13
24	15
25	1
26	13
27	9
28	5
29	17
30	13
31	11
32	9
33	5
34	17
35	7
36	17
37	19
38	1
39	3
40	15
41	17
42	7
43	21
44	19
45	5
46	11
47	21
48	19
49	13
50	1
51	23
52	5
53	17
54	19
55	25
56	13
57	25
58	23
59	1
60	5
61	15
62	27
63	9
64	19
65	25
66	17
67	11
68	5
69	25
70	27
71	23
72	29
73	29
74	25
75	23
76	19
77	29
78	13
79	31
80	31

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

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