A031417 - cp's OEIS frontend

A031417 Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 4.

n	a(n)
1	274
2	370
3	481
4	797
5	953
6	1069
7	1249
8	1313
9	1378
10	1381
11	1514
12	1657
13	1658
14	1733
15	1889
16	2125
17	2297
18	2377
19	2554
20	2557
21	2833
22	2834
23	2929
24	2941
25	3226
26	3329
27	3338
28	3433
29	3541
30	3761
31	3874
32	3989
33	4093
34	4106
35	4441
36	4442
37	4561
38	4682
39	4685
40	4933
41	4937
42	5197
43	5450

[274, 370, 481, 797, 953, 1069, 1249, 1313, 1378, 1381, 1514, 1657, 1658, 1733, 1889, 2125, 2297, 2377, 2554, 2557, 2833, 2834, 2929, 2941, 3226, 3329, 3338, 3433, 3541, 3761, 3874, 3989, 4093, 4106, 4441, 4442, 4561, 4682, 4685, 4933, 4937, 5197, 5450]

cp's OEIS Frontend

A031417 Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 4.

Table of values

List of values