A178970 - cp's OEIS frontend

A178970 a(n) = 2^(2n-1) mod (2n+1).

n	a(n)
1	2
2	3
3	4
4	2
5	6
6	7
7	2
8	9
9	10
10	2
11	12
12	8
13	20
14	15
15	16
16	2
17	22
18	19
19	2
20	21
21	22
22	38
23	24
24	32
25	2
26	27
27	52
28	2
29	30
30	31
31	2
32	8
33	34
34	2
35	36
36	37
37	17
38	43
39	40
40	20
41	42
42	8
43	2
44	45
45	32
46	2
47	27
48	49
49	29
50	51
51	52
52	23
53	54
54	55
55	2
56	57
57	77
58	11
59	15
60	28
61	2
62	108
63	64
64	2
65	66
66	32
67	47
68	69
69	70
70	2

[2, 3, 4, 2, 6, 7, 2, 9, 10, 2, 12, 8, 20, 15, 16, 2, 22, 19, 2, 21, 22, 38, 24, 32, 2, 27, 52, 2, 30, 31, 2, 8, 34, 2, 36, 37, 17, 43, 40, 20, 42, 8, 2, 45, 32, 2, 27, 49, 29, 51, 52, 23, 54, 55, 2, 57, 77, 11, 15, 28, 2, 108, 64, 2, 66, 32, 47, 69, 70, 2]

cp's OEIS Frontend

A178970 a(n) = 2^(2n-1) mod (2n+1).

Table of values

List of values

n	a(n)
1	2
2	3
3	4
4	2
5	6
6	7
7	2
8	9
9	10
10	2
11	12
12	8
13	20
14	15
15	16
16	2
17	22
18	19
19	2
20	21
21	22
22	38
23	24
24	32
25	2
26	27
27	52
28	2
29	30
30	31
31	2
32	8
33	34
34	2
35	36
36	37
37	17
38	43
39	40
40	20
41	42
42	8
43	2
44	45
45	32
46	2
47	27
48	49
49	29
50	51
51	52
52	23
53	54
54	55
55	2
56	57
57	77
58	11
59	15
60	28
61	2
62	108
63	64
64	2
65	66
66	32
67	47
68	69
69	70
70	2

n	a(n)
1	2
2	3
3	4
4	2
5	6
6	7
7	2
8	9
9	10
10	2
11	12
12	8
13	20
14	15
15	16
16	2
17	22
18	19
19	2
20	21
21	22
22	38
23	24
24	32
25	2
26	27
27	52
28	2
29	30
30	31
31	2
32	8
33	34
34	2
35	36
36	37
37	17
38	43
39	40
40	20
41	42
42	8
43	2
44	45
45	32
46	2
47	27
48	49
49	29
50	51
51	52
52	23
53	54
54	55
55	2
56	57
57	77
58	11
59	15
60	28
61	2
62	108
63	64
64	2
65	66
66	32
67	47
68	69
69	70
70	2

n	a(n)
1	2
2	3
3	4
4	2
5	6
6	7
7	2
8	9
9	10
10	2
11	12
12	8
13	20
14	15
15	16
16	2
17	22
18	19
19	2
20	21
21	22
22	38
23	24
24	32
25	2
26	27
27	52
28	2
29	30
30	31
31	2
32	8
33	34
34	2
35	36
36	37
37	17
38	43
39	40
40	20
41	42
42	8
43	2
44	45
45	32
46	2
47	27
48	49
49	29
50	51
51	52
52	23
53	54
54	55
55	2
56	57
57	77
58	11
59	15
60	28
61	2
62	108
63	64
64	2
65	66
66	32
67	47
68	69
69	70
70	2