A350381 - cp's OEIS frontend

A350381 Composite numbers k such that the multiplicative order of 2 modulo lpf(2^k-1) is k, where lpf = least prime factor.

n	a(n)
1	169
2	221
3	323
4	611
5	779
6	793
7	923
8	1121
9	1159
10	1271
11	1273
12	1349
13	1513
14	1717
15	1829
16	1919
17	2033
18	2077
19	2201
20	2413
21	2533
22	2603
23	2759
24	2951
25	3097
26	3131
27	3173
28	3193
29	3281
30	3379
31	3599
32	3721
33	3791
34	3937
35	3953
36	4043
37	4223
38	4309
39	4331
40	4607
41	4619
42	4867
43	4883
44	4981
45	5111

[169, 221, 323, 611, 779, 793, 923, 1121, 1159, 1271, 1273, 1349, 1513, 1717, 1829, 1919, 2033, 2077, 2201, 2413, 2533, 2603, 2759, 2951, 3097, 3131, 3173, 3193, 3281, 3379, 3599, 3721, 3791, 3937, 3953, 4043, 4223, 4309, 4331, 4607, 4619, 4867, 4883, 4981, 5111]

cp's OEIS Frontend

A350381 Composite numbers k such that the multiplicative order of 2 modulo lpf(2^k-1) is k, where lpf = least prime factor.

Table of values

List of values