A176176 - cp's OEIS frontend

A176176 Numbers k such that 2^(k-1) == 4^(k-1) (mod k).

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	8
8	11
9	13
10	16
11	17
12	19
13	23
14	28
15	29
16	31
17	32
18	37
19	41
20	43
21	47
22	53
23	59
24	61
25	64
26	67
27	71
28	73
29	79
30	83
31	89
32	97
33	101
34	103
35	107
36	109
37	112
38	113
39	127
40	128
41	131
42	137
43	139
44	149
45	151
46	157
47	163
48	167

[1, 2, 3, 4, 5, 7, 8, 11, 13, 16, 17, 19, 23, 28, 29, 31, 32, 37, 41, 43, 47, 53, 59, 61, 64, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 112, 113, 127, 128, 131, 137, 139, 149, 151, 157, 163, 167]

cp's OEIS Frontend

A176176 Numbers k such that 2^(k-1) == 4^(k-1) (mod k).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	8
8	11
9	13
10	16
11	17
12	19
13	23
14	28
15	29
16	31
17	32
18	37
19	41
20	43
21	47
22	53
23	59
24	61
25	64
26	67
27	71
28	73
29	79
30	83
31	89
32	97
33	101
34	103
35	107
36	109
37	112
38	113
39	127
40	128
41	131
42	137
43	139
44	149
45	151
46	157
47	163
48	167

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	8
8	11
9	13
10	16
11	17
12	19
13	23
14	28
15	29
16	31
17	32
18	37
19	41
20	43
21	47
22	53
23	59
24	61
25	64
26	67
27	71
28	73
29	79
30	83
31	89
32	97
33	101
34	103
35	107
36	109
37	112
38	113
39	127
40	128
41	131
42	137
43	139
44	149
45	151
46	157
47	163
48	167

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	8
8	11
9	13
10	16
11	17
12	19
13	23
14	28
15	29
16	31
17	32
18	37
19	41
20	43
21	47
22	53
23	59
24	61
25	64
26	67
27	71
28	73
29	79
30	83
31	89
32	97
33	101
34	103
35	107
36	109
37	112
38	113
39	127
40	128
41	131
42	137
43	139
44	149
45	151
46	157
47	163
48	167