A002338 - cp's OEIS frontend

A002338 x such that p = (x^2 + 27*y^2)/4, where p is the n-th prime of the form 3k+1.

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

[1, 5, 7, 4, 11, 8, 1, 5, 7, 17, 19, 13, 2, 20, 23, 19, 14, 25, 7, 23, 11, 13, 28, 22, 17, 29, 26, 32, 16, 35, 1, 5, 37, 35, 13, 29, 34, 31, 19, 2, 28, 10, 23, 25, 32, 43, 29, 1, 31, 11, 26, 49, 47, 17, 43, 40, 49, 37, 8, 53, 44, 50, 16, 41, 29, 49, 31, 56, 5, 7, 35, 13, 59, 47, 19, 52, 61, 41, 61, 10, 43, 14, 53, 59, 64, 65, 62, 55, 22, 65, 35, 67, 7]

cp's OEIS Frontend

A002338 x such that p = (x^2 + 27*y^2)/4, where p is the n-th prime of the form 3k+1.

Table of values

List of values

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

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

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