A130827 - cp's OEIS frontend

A130827 Least k >= 1 such that k^n + n is semiprime, or 0 if no such k exists.

n	a(n)
1	3
2	2
3	1
4	3
5	1
6	7
7	3
8	1
9	1
10	11
11	2
12	7
13	1
14	1
15	7
16	3
17	5
18	23
19	4
20	1
21	1
22	3
23	2
24	1
25	1
26	21
27	14
28	11
29	12
30	7
31	16
32	1
33	1
34	1
35	26
36	37
37	1
38	1
39	4
40	21
41	6
42	31
43	4
44	25
45	1
46	71
47	14
48	1
49	10
50	1
51	10
52	371
53	36
54	1
55	3
56	1
57	1
58	185
59	2
60	43
61	1
62	49
63	104
64	1
65	18
66	205
67	70
68	1
69	2
70	33
71	38
72	541
73	1
74	105
75	8
76	1
77	24
78	395
79	30
80	3
81	1
82	71
83	20
84	1
85	1
86	1

[3, 2, 1, 3, 1, 7, 3, 1, 1, 11, 2, 7, 1, 1, 7, 3, 5, 23, 4, 1, 1, 3, 2, 1, 1, 21, 14, 11, 12, 7, 16, 1, 1, 1, 26, 37, 1, 1, 4, 21, 6, 31, 4, 25, 1, 71, 14, 1, 10, 1, 10, 371, 36, 1, 3, 1, 1, 185, 2, 43, 1, 49, 104, 1, 18, 205, 70, 1, 2, 33, 38, 541, 1, 105, 8, 1, 24, 395, 30, 3, 1, 71, 20, 1, 1, 1]

cp's OEIS Frontend

A130827 Least k >= 1 such that k^n + n is semiprime, or 0 if no such k exists.

Table of values

List of values

n	a(n)
1	3
2	2
3	1
4	3
5	1
6	7
7	3
8	1
9	1
10	11
11	2
12	7
13	1
14	1
15	7
16	3
17	5
18	23
19	4
20	1
21	1
22	3
23	2
24	1
25	1
26	21
27	14
28	11
29	12
30	7
31	16
32	1
33	1
34	1
35	26
36	37
37	1
38	1
39	4
40	21
41	6
42	31
43	4
44	25
45	1
46	71
47	14
48	1
49	10
50	1
51	10
52	371
53	36
54	1
55	3
56	1
57	1
58	185
59	2
60	43
61	1
62	49
63	104
64	1
65	18
66	205
67	70
68	1
69	2
70	33
71	38
72	541
73	1
74	105
75	8
76	1
77	24
78	395
79	30
80	3
81	1
82	71
83	20
84	1
85	1
86	1

n	a(n)
1	3
2	2
3	1
4	3
5	1
6	7
7	3
8	1
9	1
10	11
11	2
12	7
13	1
14	1
15	7
16	3
17	5
18	23
19	4
20	1
21	1
22	3
23	2
24	1
25	1
26	21
27	14
28	11
29	12
30	7
31	16
32	1
33	1
34	1
35	26
36	37
37	1
38	1
39	4
40	21
41	6
42	31
43	4
44	25
45	1
46	71
47	14
48	1
49	10
50	1
51	10
52	371
53	36
54	1
55	3
56	1
57	1
58	185
59	2
60	43
61	1
62	49
63	104
64	1
65	18
66	205
67	70
68	1
69	2
70	33
71	38
72	541
73	1
74	105
75	8
76	1
77	24
78	395
79	30
80	3
81	1
82	71
83	20
84	1
85	1
86	1

n	a(n)
1	3
2	2
3	1
4	3
5	1
6	7
7	3
8	1
9	1
10	11
11	2
12	7
13	1
14	1
15	7
16	3
17	5
18	23
19	4
20	1
21	1
22	3
23	2
24	1
25	1
26	21
27	14
28	11
29	12
30	7
31	16
32	1
33	1
34	1
35	26
36	37
37	1
38	1
39	4
40	21
41	6
42	31
43	4
44	25
45	1
46	71
47	14
48	1
49	10
50	1
51	10
52	371
53	36
54	1
55	3
56	1
57	1
58	185
59	2
60	43
61	1
62	49
63	104
64	1
65	18
66	205
67	70
68	1
69	2
70	33
71	38
72	541
73	1
74	105
75	8
76	1
77	24
78	395
79	30
80	3
81	1
82	71
83	20
84	1
85	1
86	1