A031509 - cp's OEIS frontend

A031509 Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 11.

n	a(n)
1	123
2	127
3	131
4	139
5	151
6	163
7	167
8	488
9	512
10	520
11	544
12	608
13	640
14	672
15	1095
16	1167
17	1383
18	1455
19	1515
20	1944
21	2008
22	2136
23	2264
24	2456
25	2648
26	2696
27	3035
28	3115
29	3215
30	3235
31	3415
32	3515
33	3635
34	3715
35	3735
36	3835
37	3935
38	4115
39	4135
40	4215
41	4368
42	4944
43	5496
44	5943
45	5971

[123, 127, 131, 139, 151, 163, 167, 488, 512, 520, 544, 608, 640, 672, 1095, 1167, 1383, 1455, 1515, 1944, 2008, 2136, 2264, 2456, 2648, 2696, 3035, 3115, 3215, 3235, 3415, 3515, 3635, 3715, 3735, 3835, 3935, 4115, 4135, 4215, 4368, 4944, 5496, 5943, 5971]

cp's OEIS Frontend

A031509 Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 11.

Table of values

List of values