A381923 - cp's OEIS frontend

A381923 a(n) is the least k >= 2 such that (2^k - 1) mod (n*k - 1) = 0.

n	a(n)
1	2
2	2
3	12
4	4
5	24
6	216
7	792
8	32
9	144
10	4410
11	396
12	108
13	208
14	1880
15	3192
16	16
17	9240
18	72
19	24
20	6048
21	264
22	2160
23	1872
24	270
25	20916
26	104
27	5292
28	940
29	360
30	1596
31	756
32	8
33	132
34	4620
35	1260
36	36
37	1728
38	12
39	49500
40	3024
41	7560
42	3168
43	1440
44	1080
45	2688
46	936
47	1344
48	1035
49	44100
50	28800

[2, 2, 12, 4, 24, 216, 792, 32, 144, 4410, 396, 108, 208, 1880, 3192, 16, 9240, 72, 24, 6048, 264, 2160, 1872, 270, 20916, 104, 5292, 940, 360, 1596, 756, 8, 132, 4620, 1260, 36, 1728, 12, 49500, 3024, 7560, 3168, 1440, 1080, 2688, 936, 1344, 1035, 44100, 28800]

cp's OEIS Frontend

A381923 a(n) is the least k >= 2 such that (2^k - 1) mod (n*k - 1) = 0.

Table of values

List of values