A248220 - cp's OEIS frontend

A248220 Values of n such that the equation x^2 - ny^2 = n(n+1)*(n+2)/6 has integer solutions.

n	a(n)
1	1
2	2
3	4
4	7
5	14
6	16
7	25
8	31
9	39
10	48
11	49
12	52
13	57
14	64
15	73
16	74
17	79
18	84
19	86
20	97
21	100
22	112
23	121
24	127
25	129
26	134
27	169
28	192
29	194
30	196
31	199
32	217
33	241
34	244
35	254
36	256
37	266
38	273
39	289
40	292
41	302
42	304
43	326
44	336
45	337
46	350
47	361
48	372
49	399
50	400
51	409
52	448
53	457
54	484
55	487
56	489
57	511

[1, 2, 4, 7, 14, 16, 25, 31, 39, 48, 49, 52, 57, 64, 73, 74, 79, 84, 86, 97, 100, 112, 121, 127, 129, 134, 169, 192, 194, 196, 199, 217, 241, 244, 254, 256, 266, 273, 289, 292, 302, 304, 326, 336, 337, 350, 361, 372, 399, 400, 409, 448, 457, 484, 487, 489, 511]

cp's OEIS Frontend

A248220 Values of n such that the equation x^2 - ny^2 = n(n+1)*(n+2)/6 has integer solutions.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	7
5	14
6	16
7	25
8	31
9	39
10	48
11	49
12	52
13	57
14	64
15	73
16	74
17	79
18	84
19	86
20	97
21	100
22	112
23	121
24	127
25	129
26	134
27	169
28	192
29	194
30	196
31	199
32	217
33	241
34	244
35	254
36	256
37	266
38	273
39	289
40	292
41	302
42	304
43	326
44	336
45	337
46	350
47	361
48	372
49	399
50	400
51	409
52	448
53	457
54	484
55	487
56	489
57	511

n	a(n)
1	1
2	2
3	4
4	7
5	14
6	16
7	25
8	31
9	39
10	48
11	49
12	52
13	57
14	64
15	73
16	74
17	79
18	84
19	86
20	97
21	100
22	112
23	121
24	127
25	129
26	134
27	169
28	192
29	194
30	196
31	199
32	217
33	241
34	244
35	254
36	256
37	266
38	273
39	289
40	292
41	302
42	304
43	326
44	336
45	337
46	350
47	361
48	372
49	399
50	400
51	409
52	448
53	457
54	484
55	487
56	489
57	511

cp's OEIS Frontend

A248220 Values of n such that the equation x^2 - n*y^2 = n*(n+1)*(n+2)/6 has integer solutions.

Table of values

List of values

A248220 Values of n such that the equation x^2 - ny^2 = n(n+1)*(n+2)/6 has integer solutions.

n	a(n)
1	1
2	2
3	4
4	7
5	14
6	16
7	25
8	31
9	39
10	48
11	49
12	52
13	57
14	64
15	73
16	74
17	79
18	84
19	86
20	97
21	100
22	112
23	121
24	127
25	129
26	134
27	169
28	192
29	194
30	196
31	199
32	217
33	241
34	244
35	254
36	256
37	266
38	273
39	289
40	292
41	302
42	304
43	326
44	336
45	337
46	350
47	361
48	372
49	399
50	400
51	409
52	448
53	457
54	484
55	487
56	489
57	511