A330208 - cp's OEIS frontend

A330208 Chebyshev pseudoprimes to both base 2 and base 3: composite numbers k such that T(k, 2) == 2 (mod k) and T(k, 3) == 3 (mod k), where T(k, x) is the k-th Chebyshev polynomial of the first kind.

n	a(n)
1	5719
2	6061
3	11395
4	15841
5	17119
6	18721
7	31535
8	67199
9	73555
10	84419
11	117215
12	133399
13	133951
14	174021
15	181259
16	194833
17	226801
18	273239
19	362881
20	469201
21	516559
22	522899
23	534061
24	588455
25	665281
26	700321
27	721801
28	778261
29	903959
30	1162349
31	1561439
32	1708901
33	1755001
34	1809697

[5719, 6061, 11395, 15841, 17119, 18721, 31535, 67199, 73555, 84419, 117215, 133399, 133951, 174021, 181259, 194833, 226801, 273239, 362881, 469201, 516559, 522899, 534061, 588455, 665281, 700321, 721801, 778261, 903959, 1162349, 1561439, 1708901, 1755001, 1809697]

cp's OEIS Frontend

A330208 Chebyshev pseudoprimes to both base 2 and base 3: composite numbers k such that T(k, 2) == 2 (mod k) and T(k, 3) == 3 (mod k), where T(k, x) is the k-th Chebyshev polynomial of the first kind.

Table of values

List of values