A085245 - cp's OEIS frontend

A085245 Least k such that k*2^n + 1 is a semiprime.

n	a(n)
1	4
2	2
3	1
4	2
5	1
6	1
7	1
8	6
9	3
10	2
11	1
12	1
13	1
14	6
15	3
16	2
17	1
18	2
19	1
20	1
21	3
22	2
23	1
24	3
25	8
26	4
27	2
28	1
29	3
30	2
31	1
32	1
33	3
34	7
35	5
36	5
37	8
38	4
39	2
40	1
41	4
42	2
43	1
44	3
45	3
46	7
47	6
48	3
49	15
50	9
51	29
52	28
53	14
54	7
55	6
56	3
57	3
58	8
59	4
60	2
61	1
62	4
63	2
64	1
65	14
66	7
67	12
68	6
69	3
70	3
71	9
72	5
73	12
74	6
75	3
76	8
77	4
78	2
79	1
80	3
81	29
82	18
83	9
84	18
85	9
86	10
87	5
88	13
89	8
90	4
91	2
92	1
93	15
94	12
95	6
96	3
97	9
98	6

[4, 2, 1, 2, 1, 1, 1, 6, 3, 2, 1, 1, 1, 6, 3, 2, 1, 2, 1, 1, 3, 2, 1, 3, 8, 4, 2, 1, 3, 2, 1, 1, 3, 7, 5, 5, 8, 4, 2, 1, 4, 2, 1, 3, 3, 7, 6, 3, 15, 9, 29, 28, 14, 7, 6, 3, 3, 8, 4, 2, 1, 4, 2, 1, 14, 7, 12, 6, 3, 3, 9, 5, 12, 6, 3, 8, 4, 2, 1, 3, 29, 18, 9, 18, 9, 10, 5, 13, 8, 4, 2, 1, 15, 12, 6, 3, 9, 6]

cp's OEIS Frontend

A085245 Least k such that k*2^n + 1 is a semiprime.

Table of values

List of values

n	a(n)
1	4
2	2
3	1
4	2
5	1
6	1
7	1
8	6
9	3
10	2
11	1
12	1
13	1
14	6
15	3
16	2
17	1
18	2
19	1
20	1
21	3
22	2
23	1
24	3
25	8
26	4
27	2
28	1
29	3
30	2
31	1
32	1
33	3
34	7
35	5
36	5
37	8
38	4
39	2
40	1
41	4
42	2
43	1
44	3
45	3
46	7
47	6
48	3
49	15
50	9
51	29
52	28
53	14
54	7
55	6
56	3
57	3
58	8
59	4
60	2
61	1
62	4
63	2
64	1
65	14
66	7
67	12
68	6
69	3
70	3
71	9
72	5
73	12
74	6
75	3
76	8
77	4
78	2
79	1
80	3
81	29
82	18
83	9
84	18
85	9
86	10
87	5
88	13
89	8
90	4
91	2
92	1
93	15
94	12
95	6
96	3
97	9
98	6

n	a(n)
1	4
2	2
3	1
4	2
5	1
6	1
7	1
8	6
9	3
10	2
11	1
12	1
13	1
14	6
15	3
16	2
17	1
18	2
19	1
20	1
21	3
22	2
23	1
24	3
25	8
26	4
27	2
28	1
29	3
30	2
31	1
32	1
33	3
34	7
35	5
36	5
37	8
38	4
39	2
40	1
41	4
42	2
43	1
44	3
45	3
46	7
47	6
48	3
49	15
50	9
51	29
52	28
53	14
54	7
55	6
56	3
57	3
58	8
59	4
60	2
61	1
62	4
63	2
64	1
65	14
66	7
67	12
68	6
69	3
70	3
71	9
72	5
73	12
74	6
75	3
76	8
77	4
78	2
79	1
80	3
81	29
82	18
83	9
84	18
85	9
86	10
87	5
88	13
89	8
90	4
91	2
92	1
93	15
94	12
95	6
96	3
97	9
98	6

n	a(n)
1	4
2	2
3	1
4	2
5	1
6	1
7	1
8	6
9	3
10	2
11	1
12	1
13	1
14	6
15	3
16	2
17	1
18	2
19	1
20	1
21	3
22	2
23	1
24	3
25	8
26	4
27	2
28	1
29	3
30	2
31	1
32	1
33	3
34	7
35	5
36	5
37	8
38	4
39	2
40	1
41	4
42	2
43	1
44	3
45	3
46	7
47	6
48	3
49	15
50	9
51	29
52	28
53	14
54	7
55	6
56	3
57	3
58	8
59	4
60	2
61	1
62	4
63	2
64	1
65	14
66	7
67	12
68	6
69	3
70	3
71	9
72	5
73	12
74	6
75	3
76	8
77	4
78	2
79	1
80	3
81	29
82	18
83	9
84	18
85	9
86	10
87	5
88	13
89	8
90	4
91	2
92	1
93	15
94	12
95	6
96	3
97	9
98	6