A101406 - cp's OEIS frontend

A101406 a(n) = least k such that k^n*(k^n-1)-1 is prime.

n	a(n)
1	3
2	2
3	3
4	2
5	2
6	3
7	3
8	19
9	2
10	2
11	45
12	7
13	15
14	7
15	5
16	5
17	44
18	2
19	4
20	3
21	84
22	62
23	128
24	5
25	4
26	90
27	16
28	37
29	15
30	11
31	311
32	15
33	295
34	72
35	3
36	3
37	242
38	2
39	126
40	64
41	152
42	11
43	78
44	26
45	2
46	13
47	14
48	26
49	140
50	2
51	24
52	16
53	157
54	4
55	49
56	13
57	2
58	123
59	64
60	16
61	61
62	206
63	6
64	76
65	412
66	31
67	84
68	23
69	24
70	9
71	471
72	26
73	422
74	227
75	8

[3, 2, 3, 2, 2, 3, 3, 19, 2, 2, 45, 7, 15, 7, 5, 5, 44, 2, 4, 3, 84, 62, 128, 5, 4, 90, 16, 37, 15, 11, 311, 15, 295, 72, 3, 3, 242, 2, 126, 64, 152, 11, 78, 26, 2, 13, 14, 26, 140, 2, 24, 16, 157, 4, 49, 13, 2, 123, 64, 16, 61, 206, 6, 76, 412, 31, 84, 23, 24, 9, 471, 26, 422, 227, 8]

cp's OEIS Frontend

A101406 a(n) = least k such that k^n*(k^n-1)-1 is prime.

Table of values

List of values

n	a(n)
1	3
2	2
3	3
4	2
5	2
6	3
7	3
8	19
9	2
10	2
11	45
12	7
13	15
14	7
15	5
16	5
17	44
18	2
19	4
20	3
21	84
22	62
23	128
24	5
25	4
26	90
27	16
28	37
29	15
30	11
31	311
32	15
33	295
34	72
35	3
36	3
37	242
38	2
39	126
40	64
41	152
42	11
43	78
44	26
45	2
46	13
47	14
48	26
49	140
50	2
51	24
52	16
53	157
54	4
55	49
56	13
57	2
58	123
59	64
60	16
61	61
62	206
63	6
64	76
65	412
66	31
67	84
68	23
69	24
70	9
71	471
72	26
73	422
74	227
75	8

n	a(n)
1	3
2	2
3	3
4	2
5	2
6	3
7	3
8	19
9	2
10	2
11	45
12	7
13	15
14	7
15	5
16	5
17	44
18	2
19	4
20	3
21	84
22	62
23	128
24	5
25	4
26	90
27	16
28	37
29	15
30	11
31	311
32	15
33	295
34	72
35	3
36	3
37	242
38	2
39	126
40	64
41	152
42	11
43	78
44	26
45	2
46	13
47	14
48	26
49	140
50	2
51	24
52	16
53	157
54	4
55	49
56	13
57	2
58	123
59	64
60	16
61	61
62	206
63	6
64	76
65	412
66	31
67	84
68	23
69	24
70	9
71	471
72	26
73	422
74	227
75	8

n	a(n)
1	3
2	2
3	3
4	2
5	2
6	3
7	3
8	19
9	2
10	2
11	45
12	7
13	15
14	7
15	5
16	5
17	44
18	2
19	4
20	3
21	84
22	62
23	128
24	5
25	4
26	90
27	16
28	37
29	15
30	11
31	311
32	15
33	295
34	72
35	3
36	3
37	242
38	2
39	126
40	64
41	152
42	11
43	78
44	26
45	2
46	13
47	14
48	26
49	140
50	2
51	24
52	16
53	157
54	4
55	49
56	13
57	2
58	123
59	64
60	16
61	61
62	206
63	6
64	76
65	412
66	31
67	84
68	23
69	24
70	9
71	471
72	26
73	422
74	227
75	8