A330206 - cp's OEIS frontend

A330206 Chebyshev pseudoprimes to base 2: composite numbers k such that T(k, 2) == 2 (mod k), where T(k, x) is the k-th Chebyshev polynomial of the first kind.

n	a(n)
1	209
2	231
3	399
4	455
5	901
6	903
7	923
8	989
9	1295
10	1729
11	1855
12	2015
13	2211
14	2345
15	2639
16	2701
17	2795
18	2911
19	3007
20	3201
21	3439
22	3535
23	3801
24	4823
25	5291
26	5719
27	6061
28	6767
29	6989
30	7421
31	8569
32	9503
33	9591
34	9869
35	10439
36	10609
37	11041
38	11395
39	11951
40	11991
41	13133
42	13529
43	13735
44	13871

[209, 231, 399, 455, 901, 903, 923, 989, 1295, 1729, 1855, 2015, 2211, 2345, 2639, 2701, 2795, 2911, 3007, 3201, 3439, 3535, 3801, 4823, 5291, 5719, 6061, 6767, 6989, 7421, 8569, 9503, 9591, 9869, 10439, 10609, 11041, 11395, 11951, 11991, 13133, 13529, 13735, 13871]

cp's OEIS Frontend

A330206 Chebyshev pseudoprimes to base 2: composite numbers k such that T(k, 2) == 2 (mod k), where T(k, x) is the k-th Chebyshev polynomial of the first kind.

Table of values

List of values