A378710 - cp's OEIS frontend

A378710 Positive numbers k such that -k is properly represented by the Pell Form x^2 - 15*y^2.

n	a(n)
1	6
2	11
3	14
4	15
5	35
6	51
7	59
8	71
9	86
10	110
11	119
12	131
13	134
14	159
15	179
16	191
17	206
18	215
19	231
20	239
21	251
22	254
23	294
24	311
25	326
26	335
27	339
28	359
29	366
30	371
31	374
32	411
33	419
34	431
35	446
36	479
37	491
38	519
39	515
40	519
41	539
42	566
43	590
44	591
45	599
46	614
47	635
48	654
49	659
50	671
51	686

[6, 11, 14, 15, 35, 51, 59, 71, 86, 110, 119, 131, 134, 159, 179, 191, 206, 215, 231, 239, 251, 254, 294, 311, 326, 335, 339, 359, 366, 371, 374, 411, 419, 431, 446, 479, 491, 519, 515, 519, 539, 566, 590, 591, 599, 614, 635, 654, 659, 671, 686]

cp's OEIS Frontend

A378710 Positive numbers k such that -k is properly represented by the Pell Form x^2 - 15*y^2.

Table of values

List of values

n	a(n)
1	6
2	11
3	14
4	15
5	35
6	51
7	59
8	71
9	86
10	110
11	119
12	131
13	134
14	159
15	179
16	191
17	206
18	215
19	231
20	239
21	251
22	254
23	294
24	311
25	326
26	335
27	339
28	359
29	366
30	371
31	374
32	411
33	419
34	431
35	446
36	479
37	491
38	519
39	515
40	519
41	539
42	566
43	590
44	591
45	599
46	614
47	635
48	654
49	659
50	671
51	686

n	a(n)
1	6
2	11
3	14
4	15
5	35
6	51
7	59
8	71
9	86
10	110
11	119
12	131
13	134
14	159
15	179
16	191
17	206
18	215
19	231
20	239
21	251
22	254
23	294
24	311
25	326
26	335
27	339
28	359
29	366
30	371
31	374
32	411
33	419
34	431
35	446
36	479
37	491
38	519
39	515
40	519
41	539
42	566
43	590
44	591
45	599
46	614
47	635
48	654
49	659
50	671
51	686

n	a(n)
1	6
2	11
3	14
4	15
5	35
6	51
7	59
8	71
9	86
10	110
11	119
12	131
13	134
14	159
15	179
16	191
17	206
18	215
19	231
20	239
21	251
22	254
23	294
24	311
25	326
26	335
27	339
28	359
29	366
30	371
31	374
32	411
33	419
34	431
35	446
36	479
37	491
38	519
39	515
40	519
41	539
42	566
43	590
44	591
45	599
46	614
47	635
48	654
49	659
50	671
51	686