A139791 - cp's OEIS frontend

A139791 Numbers n for which 2n is a multiple of A002326(n), the multiplicative order of 2 mod 2n+1.

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	8
7	9
8	11
9	14
10	15
11	18
12	20
13	21
14	23
15	26
16	29
17	30
18	33
19	35
20	36
21	39
22	41
23	44
24	48
25	50
26	51
27	53
28	54
29	56
30	63
31	65
32	68
33	69
34	74
35	75
36	78
37	81
38	83
39	86
40	89
41	90
42	95
43	96
44	98
45	99
46	105
47	111
48	113
49	114
50	116
51	119
52	120
53	125
54	128
55	131
56	134
57	135
58	138
59	140
60	141
61	146
62	153
63	155
64	156
65	158
66	165
67	168
68	170

[1, 2, 3, 5, 6, 8, 9, 11, 14, 15, 18, 20, 21, 23, 26, 29, 30, 33, 35, 36, 39, 41, 44, 48, 50, 51, 53, 54, 56, 63, 65, 68, 69, 74, 75, 78, 81, 83, 86, 89, 90, 95, 96, 98, 99, 105, 111, 113, 114, 116, 119, 120, 125, 128, 131, 134, 135, 138, 140, 141, 146, 153, 155, 156, 158, 165, 168, 170]

cp's OEIS Frontend

A139791 Numbers n for which 2n is a multiple of A002326(n), the multiplicative order of 2 mod 2n+1.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	8
7	9
8	11
9	14
10	15
11	18
12	20
13	21
14	23
15	26
16	29
17	30
18	33
19	35
20	36
21	39
22	41
23	44
24	48
25	50
26	51
27	53
28	54
29	56
30	63
31	65
32	68
33	69
34	74
35	75
36	78
37	81
38	83
39	86
40	89
41	90
42	95
43	96
44	98
45	99
46	105
47	111
48	113
49	114
50	116
51	119
52	120
53	125
54	128
55	131
56	134
57	135
58	138
59	140
60	141
61	146
62	153
63	155
64	156
65	158
66	165
67	168
68	170

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	8
7	9
8	11
9	14
10	15
11	18
12	20
13	21
14	23
15	26
16	29
17	30
18	33
19	35
20	36
21	39
22	41
23	44
24	48
25	50
26	51
27	53
28	54
29	56
30	63
31	65
32	68
33	69
34	74
35	75
36	78
37	81
38	83
39	86
40	89
41	90
42	95
43	96
44	98
45	99
46	105
47	111
48	113
49	114
50	116
51	119
52	120
53	125
54	128
55	131
56	134
57	135
58	138
59	140
60	141
61	146
62	153
63	155
64	156
65	158
66	165
67	168
68	170

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	8
7	9
8	11
9	14
10	15
11	18
12	20
13	21
14	23
15	26
16	29
17	30
18	33
19	35
20	36
21	39
22	41
23	44
24	48
25	50
26	51
27	53
28	54
29	56
30	63
31	65
32	68
33	69
34	74
35	75
36	78
37	81
38	83
39	86
40	89
41	90
42	95
43	96
44	98
45	99
46	105
47	111
48	113
49	114
50	116
51	119
52	120
53	125
54	128
55	131
56	134
57	135
58	138
59	140
60	141
61	146
62	153
63	155
64	156
65	158
66	165
67	168
68	170