A031399 - cp's OEIS frontend

A031399 Numbers n with no 4k+3 factors such that Pell equation x^2 - n y^2 = -1 insoluble.

n	a(n)
1	4
2	8
3	16
4	20
5	25
6	32
7	34
8	40
9	52
10	64
11	68
12	80
13	100
14	104
15	116
16	128
17	136
18	146
19	148
20	160
21	164
22	169
23	178
24	194
25	200
26	205
27	208
28	212
29	221
30	232
31	244
32	256
33	260
34	272
35	289
36	292
37	296
38	305
39	320
40	328
41	340
42	356
43	377
44	386
45	388
46	400
47	404
48	410
49	416
50	424
51	436
52	452

[4, 8, 16, 20, 25, 32, 34, 40, 52, 64, 68, 80, 100, 104, 116, 128, 136, 146, 148, 160, 164, 169, 178, 194, 200, 205, 208, 212, 221, 232, 244, 256, 260, 272, 289, 292, 296, 305, 320, 328, 340, 356, 377, 386, 388, 400, 404, 410, 416, 424, 436, 452]

cp's OEIS Frontend

A031399 Numbers n with no 4k+3 factors such that Pell equation x^2 - n y^2 = -1 insoluble.

Table of values

List of values

n	a(n)
1	4
2	8
3	16
4	20
5	25
6	32
7	34
8	40
9	52
10	64
11	68
12	80
13	100
14	104
15	116
16	128
17	136
18	146
19	148
20	160
21	164
22	169
23	178
24	194
25	200
26	205
27	208
28	212
29	221
30	232
31	244
32	256
33	260
34	272
35	289
36	292
37	296
38	305
39	320
40	328
41	340
42	356
43	377
44	386
45	388
46	400
47	404
48	410
49	416
50	424
51	436
52	452

n	a(n)
1	4
2	8
3	16
4	20
5	25
6	32
7	34
8	40
9	52
10	64
11	68
12	80
13	100
14	104
15	116
16	128
17	136
18	146
19	148
20	160
21	164
22	169
23	178
24	194
25	200
26	205
27	208
28	212
29	221
30	232
31	244
32	256
33	260
34	272
35	289
36	292
37	296
38	305
39	320
40	328
41	340
42	356
43	377
44	386
45	388
46	400
47	404
48	410
49	416
50	424
51	436
52	452

n	a(n)
1	4
2	8
3	16
4	20
5	25
6	32
7	34
8	40
9	52
10	64
11	68
12	80
13	100
14	104
15	116
16	128
17	136
18	146
19	148
20	160
21	164
22	169
23	178
24	194
25	200
26	205
27	208
28	212
29	221
30	232
31	244
32	256
33	260
34	272
35	289
36	292
37	296
38	305
39	320
40	328
41	340
42	356
43	377
44	386
45	388
46	400
47	404
48	410
49	416
50	424
51	436
52	452