A153091 - cp's OEIS frontend

A153091 a(n) = least positive k such that k5^n(5^n-1)+j is prime, with j = -1 or 1 or both.

n	a(n)
1	1
2	1
3	3
4	1
5	2
6	5
7	5
8	1
9	2
10	2
11	18
12	12
13	12
14	7
15	1
16	1
17	4
18	1
19	9
20	2
21	36
22	10
23	70
24	1
25	3
26	16
27	6
28	3
29	2
30	9
31	74
32	4
33	6
34	19
35	20
36	8
37	14
38	2
39	2
40	62
41	3
42	29
43	47
44	11
45	47
46	16
47	58
48	1
49	49
50	18
51	51
52	3
53	12
54	5
55	18
56	23
57	1
58	19
59	54
60	7
61	35
62	12
63	7
64	1
65	12
66	3
67	5
68	121
69	70
70	89
71	12
72	61
73	33
74	36
75	9
76	17
77	135
78	35
79	21
80	23
81	20
82	86
83	18

[1, 1, 3, 1, 2, 5, 5, 1, 2, 2, 18, 12, 12, 7, 1, 1, 4, 1, 9, 2, 36, 10, 70, 1, 3, 16, 6, 3, 2, 9, 74, 4, 6, 19, 20, 8, 14, 2, 2, 62, 3, 29, 47, 11, 47, 16, 58, 1, 49, 18, 51, 3, 12, 5, 18, 23, 1, 19, 54, 7, 35, 12, 7, 1, 12, 3, 5, 121, 70, 89, 12, 61, 33, 36, 9, 17, 135, 35, 21, 23, 20, 86, 18]

cp's OEIS Frontend

A153091 a(n) = least positive k such that k5^n(5^n-1)+j is prime, with j = -1 or 1 or both.

Table of values

List of values

n	a(n)
1	1
2	1
3	3
4	1
5	2
6	5
7	5
8	1
9	2
10	2
11	18
12	12
13	12
14	7
15	1
16	1
17	4
18	1
19	9
20	2
21	36
22	10
23	70
24	1
25	3
26	16
27	6
28	3
29	2
30	9
31	74
32	4
33	6
34	19
35	20
36	8
37	14
38	2
39	2
40	62
41	3
42	29
43	47
44	11
45	47
46	16
47	58
48	1
49	49
50	18
51	51
52	3
53	12
54	5
55	18
56	23
57	1
58	19
59	54
60	7
61	35
62	12
63	7
64	1
65	12
66	3
67	5
68	121
69	70
70	89
71	12
72	61
73	33
74	36
75	9
76	17
77	135
78	35
79	21
80	23
81	20
82	86
83	18

n	a(n)
1	1
2	1
3	3
4	1
5	2
6	5
7	5
8	1
9	2
10	2
11	18
12	12
13	12
14	7
15	1
16	1
17	4
18	1
19	9
20	2
21	36
22	10
23	70
24	1
25	3
26	16
27	6
28	3
29	2
30	9
31	74
32	4
33	6
34	19
35	20
36	8
37	14
38	2
39	2
40	62
41	3
42	29
43	47
44	11
45	47
46	16
47	58
48	1
49	49
50	18
51	51
52	3
53	12
54	5
55	18
56	23
57	1
58	19
59	54
60	7
61	35
62	12
63	7
64	1
65	12
66	3
67	5
68	121
69	70
70	89
71	12
72	61
73	33
74	36
75	9
76	17
77	135
78	35
79	21
80	23
81	20
82	86
83	18

cp's OEIS Frontend

A153091 a(n) = least positive k such that k*5^n*(5^n-1)+j is prime, with j = -1 or 1 or both.

Table of values

List of values

A153091 a(n) = least positive k such that k5^n(5^n-1)+j is prime, with j = -1 or 1 or both.

n	a(n)
1	1
2	1
3	3
4	1
5	2
6	5
7	5
8	1
9	2
10	2
11	18
12	12
13	12
14	7
15	1
16	1
17	4
18	1
19	9
20	2
21	36
22	10
23	70
24	1
25	3
26	16
27	6
28	3
29	2
30	9
31	74
32	4
33	6
34	19
35	20
36	8
37	14
38	2
39	2
40	62
41	3
42	29
43	47
44	11
45	47
46	16
47	58
48	1
49	49
50	18
51	51
52	3
53	12
54	5
55	18
56	23
57	1
58	19
59	54
60	7
61	35
62	12
63	7
64	1
65	12
66	3
67	5
68	121
69	70
70	89
71	12
72	61
73	33
74	36
75	9
76	17
77	135
78	35
79	21
80	23
81	20
82	86
83	18