A031415 - cp's OEIS frontend

A031415 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 2.

n	a(n)
1	41
2	61
3	113
4	130
5	181
6	202
7	265
8	269
9	313
10	317
11	394
12	421
13	458
14	586
15	613
16	617
17	685
18	697
19	761
20	773
21	853
22	925
23	929
24	937
25	986
26	1013
27	1066
28	1109
29	1117
30	1201
31	1213
32	1301
33	1325
34	1354
35	1409
36	1417
37	1429
38	1466
39	1586
40	1625
41	1637
42	1649
43	1714
44	1741
45	1745
46	1753
47	1861

[41, 61, 113, 130, 181, 202, 265, 269, 313, 317, 394, 421, 458, 586, 613, 617, 685, 697, 761, 773, 853, 925, 929, 937, 986, 1013, 1066, 1109, 1117, 1201, 1213, 1301, 1325, 1354, 1409, 1417, 1429, 1466, 1586, 1625, 1637, 1649, 1714, 1741, 1745, 1753, 1861]

cp's OEIS Frontend

A031415 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 2.

Table of values

List of values