A002341 - cp's OEIS frontend

A002341 Numbers y such that p = x^2 - 5y^2, where p = 0, 1, or 4 (mod 5).

n	a(n)
1	2
2	1
3	3
4	2
5	1
6	4
7	1
8	2
9	5
10	7
11	4
12	2
13	6
14	5
15	1
16	2
17	3
18	11
19	6
20	1
21	5
22	3
23	10
24	7
25	12
26	1
27	2
28	9
29	4
30	13
31	7
32	6
33	5
34	9
35	14
36	16
37	8
38	11
39	2
40	7
41	3
42	4
43	10
44	1
45	17
46	19
47	2
48	8
49	14
50	16
51	1
52	13
53	20
54	9
55	3
56	8
57	5
58	6
59	11
60	14

[2, 1, 3, 2, 1, 4, 1, 2, 5, 7, 4, 2, 6, 5, 1, 2, 3, 11, 6, 1, 5, 3, 10, 7, 12, 1, 2, 9, 4, 13, 7, 6, 5, 9, 14, 16, 8, 11, 2, 7, 3, 4, 10, 1, 17, 19, 2, 8, 14, 16, 1, 13, 20, 9, 3, 8, 5, 6, 11, 14]

cp's OEIS Frontend

A002341 Numbers y such that p = x^2 - 5y^2, where p = 0, 1, or 4 (mod 5).

Table of values

List of values

n	a(n)
1	2
2	1
3	3
4	2
5	1
6	4
7	1
8	2
9	5
10	7
11	4
12	2
13	6
14	5
15	1
16	2
17	3
18	11
19	6
20	1
21	5
22	3
23	10
24	7
25	12
26	1
27	2
28	9
29	4
30	13
31	7
32	6
33	5
34	9
35	14
36	16
37	8
38	11
39	2
40	7
41	3
42	4
43	10
44	1
45	17
46	19
47	2
48	8
49	14
50	16
51	1
52	13
53	20
54	9
55	3
56	8
57	5
58	6
59	11
60	14

n	a(n)
1	2
2	1
3	3
4	2
5	1
6	4
7	1
8	2
9	5
10	7
11	4
12	2
13	6
14	5
15	1
16	2
17	3
18	11
19	6
20	1
21	5
22	3
23	10
24	7
25	12
26	1
27	2
28	9
29	4
30	13
31	7
32	6
33	5
34	9
35	14
36	16
37	8
38	11
39	2
40	7
41	3
42	4
43	10
44	1
45	17
46	19
47	2
48	8
49	14
50	16
51	1
52	13
53	20
54	9
55	3
56	8
57	5
58	6
59	11
60	14

n	a(n)
1	2
2	1
3	3
4	2
5	1
6	4
7	1
8	2
9	5
10	7
11	4
12	2
13	6
14	5
15	1
16	2
17	3
18	11
19	6
20	1
21	5
22	3
23	10
24	7
25	12
26	1
27	2
28	9
29	4
30	13
31	7
32	6
33	5
34	9
35	14
36	16
37	8
38	11
39	2
40	7
41	3
42	4
43	10
44	1
45	17
46	19
47	2
48	8
49	14
50	16
51	1
52	13
53	20
54	9
55	3
56	8
57	5
58	6
59	11
60	14