A031408 - cp's OEIS frontend

A031408 Numbers k such that the continued fraction for sqrt(k) has even period 2*m and the m-th term of the periodic part is 5.

n	a(n)
1	27
2	31
3	43
4	47
5	104
6	128
7	160
8	192
9	231
10	303
11	375
12	408
13	435
14	472
15	536
16	635
17	664
18	715
19	776
20	815
21	835
22	912
23	1115
24	1135
25	1215
26	1239
27	1267
28	1464
29	1488
30	1575
31	1603
32	1616
33	1631
34	1712
35	1744
36	1752
37	1840
38	1883
39	1967
40	1968
41	2000
42	2043
43	2051
44	2096
45	2135
46	2224
47	2259

[27, 31, 43, 47, 104, 128, 160, 192, 231, 303, 375, 408, 435, 472, 536, 635, 664, 715, 776, 815, 835, 912, 1115, 1135, 1215, 1239, 1267, 1464, 1488, 1575, 1603, 1616, 1631, 1712, 1744, 1752, 1840, 1883, 1967, 1968, 2000, 2043, 2051, 2096, 2135, 2224, 2259]

cp's OEIS Frontend

A031408 Numbers k such that the continued fraction for sqrt(k) has even period 2*m and the m-th term of the periodic part is 5.

Table of values

List of values