A175593 - cp's OEIS frontend

A175593 Numbers k such that 2k has no primitive root but 2k-1 and 2*k+1 both have primitive roots.

n	a(n)
1	4
2	6
3	12
4	14
5	15
6	21
7	24
8	30
9	36
10	40
11	51
12	54
13	63
14	69
15	75
16	84
17	90
18	96
19	99
20	114
21	120
22	135
23	141
24	156
25	174
26	180
27	210
28	216
29	231
30	261
31	285
32	300
33	309
34	321
35	330
36	364
37	405
38	411
39	414
40	420
41	429
42	441
43	510
44	516
45	525
46	531
47	546
48	576
49	615
50	639
51	645
52	651
53	660
54	684
55	714
56	726
57	741

[4, 6, 12, 14, 15, 21, 24, 30, 36, 40, 51, 54, 63, 69, 75, 84, 90, 96, 99, 114, 120, 135, 141, 156, 174, 180, 210, 216, 231, 261, 285, 300, 309, 321, 330, 364, 405, 411, 414, 420, 429, 441, 510, 516, 525, 531, 546, 576, 615, 639, 645, 651, 660, 684, 714, 726, 741]

cp's OEIS Frontend

A175593 Numbers k such that 2k has no primitive root but 2k-1 and 2*k+1 both have primitive roots.

Table of values

List of values

n	a(n)
1	4
2	6
3	12
4	14
5	15
6	21
7	24
8	30
9	36
10	40
11	51
12	54
13	63
14	69
15	75
16	84
17	90
18	96
19	99
20	114
21	120
22	135
23	141
24	156
25	174
26	180
27	210
28	216
29	231
30	261
31	285
32	300
33	309
34	321
35	330
36	364
37	405
38	411
39	414
40	420
41	429
42	441
43	510
44	516
45	525
46	531
47	546
48	576
49	615
50	639
51	645
52	651
53	660
54	684
55	714
56	726
57	741

n	a(n)
1	4
2	6
3	12
4	14
5	15
6	21
7	24
8	30
9	36
10	40
11	51
12	54
13	63
14	69
15	75
16	84
17	90
18	96
19	99
20	114
21	120
22	135
23	141
24	156
25	174
26	180
27	210
28	216
29	231
30	261
31	285
32	300
33	309
34	321
35	330
36	364
37	405
38	411
39	414
40	420
41	429
42	441
43	510
44	516
45	525
46	531
47	546
48	576
49	615
50	639
51	645
52	651
53	660
54	684
55	714
56	726
57	741

cp's OEIS Frontend

A175593 Numbers k such that 2*k has no primitive root but 2*k-1 and 2*k+1 both have primitive roots.

Table of values

List of values

A175593 Numbers k such that 2k has no primitive root but 2k-1 and 2*k+1 both have primitive roots.

n	a(n)
1	4
2	6
3	12
4	14
5	15
6	21
7	24
8	30
9	36
10	40
11	51
12	54
13	63
14	69
15	75
16	84
17	90
18	96
19	99
20	114
21	120
22	135
23	141
24	156
25	174
26	180
27	210
28	216
29	231
30	261
31	285
32	300
33	309
34	321
35	330
36	364
37	405
38	411
39	414
40	420
41	429
42	441
43	510
44	516
45	525
46	531
47	546
48	576
49	615
50	639
51	645
52	651
53	660
54	684
55	714
56	726
57	741