A278792 - cp's OEIS frontend

A278792 a(n) is the positive integer x such that 3^((M-1)/(2*p)) == -2^x (mod M), where p > 2 is prime, M=2^p-1 is the n-th Mersenne prime and x < p.

n	a(n)
2	2
3	2
4	1
5	6
6	16
7	4
8	5
9	25
10	18
11	20
12	45
13	61
14	91
15	939
16	817
17	336
18	862
19	2533
20	3404
21	2822
22	3136
23	1554
24	9371
25	10712
26	21311
27	44296
28	68185
29	66909
30	31147
31	25648

[2, 2, 1, 6, 16, 4, 5, 25, 18, 20, 45, 61, 91, 939, 817, 336, 862, 2533, 3404, 2822, 3136, 1554, 9371, 10712, 21311, 44296, 68185, 66909, 31147, 25648]

cp's OEIS Frontend

A278792 a(n) is the positive integer x such that 3^((M-1)/(2*p)) == -2^x (mod M), where p > 2 is prime, M=2^p-1 is the n-th Mersenne prime and x < p.

Table of values

List of values