A031421 - cp's OEIS frontend

A031421 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 8.

n	a(n)
1	509
2	1450
3	2237
4	2425
5	3946
6	4778
7	5189
8	5473
9	5618
10	5914
11	6445
12	6761
13	7417
14	8185
15	9178
16	9938
17	10133
18	10426
19	10529
20	10826
21	10933
22	11441
23	11861
24	12074
25	12289
26	12506
27	12829
28	13273
29	14653
30	14765
31	15241
32	16217
33	16586
34	16837
35	17090
36	17989
37	18385
38	18650
39	18778

[509, 1450, 2237, 2425, 3946, 4778, 5189, 5473, 5618, 5914, 6445, 6761, 7417, 8185, 9178, 9938, 10133, 10426, 10529, 10826, 10933, 11441, 11861, 12074, 12289, 12506, 12829, 13273, 14653, 14765, 15241, 16217, 16586, 16837, 17090, 17989, 18385, 18650, 18778]

cp's OEIS Frontend

A031421 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 8.

Table of values

List of values