A233390 - cp's OEIS frontend

A233390 a(n) = |{0 < k < n: 2^k - 1 + q(n-k) is prime}|, where q(.) is the strict partition function (A000009).

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	2
8	2
9	2
10	1
11	4
12	4
13	4
14	2
15	3
16	2
17	3
18	3
19	7
20	4
21	4
22	5
23	3
24	4
25	5
26	5
27	5
28	6
29	7
30	6
31	5
32	4
33	4
34	9
35	3
36	6
37	6
38	5
39	4
40	7
41	1
42	4
43	5
44	6
45	9
46	6
47	8
48	6
49	8
50	4
51	5
52	8
53	7
54	4
55	3
56	4
57	7
58	6
59	6
60	3
61	6
62	5
63	6
64	4
65	6
66	8
67	7
68	8
69	4
70	5
71	3
72	6
73	7
74	7
75	3
76	10
77	7
78	5
79	6
80	10
81	4
82	8
83	4
84	6
85	7
86	6
87	8
88	10
89	4
90	6
91	8
92	9
93	5
94	6
95	5
96	7
97	13
98	5
99	5
100	6

[0, 1, 1, 1, 2, 1, 2, 2, 2, 1, 4, 4, 4, 2, 3, 2, 3, 3, 7, 4, 4, 5, 3, 4, 5, 5, 5, 6, 7, 6, 5, 4, 4, 9, 3, 6, 6, 5, 4, 7, 1, 4, 5, 6, 9, 6, 8, 6, 8, 4, 5, 8, 7, 4, 3, 4, 7, 6, 6, 3, 6, 5, 6, 4, 6, 8, 7, 8, 4, 5, 3, 6, 7, 7, 3, 10, 7, 5, 6, 10, 4, 8, 4, 6, 7, 6, 8, 10, 4, 6, 8, 9, 5, 6, 5, 7, 13, 5, 5, 6]

cp's OEIS Frontend

A233390 a(n) = |{0 < k < n: 2^k - 1 + q(n-k) is prime}|, where q(.) is the strict partition function (A000009).

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	2
8	2
9	2
10	1
11	4
12	4
13	4
14	2
15	3
16	2
17	3
18	3
19	7
20	4
21	4
22	5
23	3
24	4
25	5
26	5
27	5
28	6
29	7
30	6
31	5
32	4
33	4
34	9
35	3
36	6
37	6
38	5
39	4
40	7
41	1
42	4
43	5
44	6
45	9
46	6
47	8
48	6
49	8
50	4
51	5
52	8
53	7
54	4
55	3
56	4
57	7
58	6
59	6
60	3
61	6
62	5
63	6
64	4
65	6
66	8
67	7
68	8
69	4
70	5
71	3
72	6
73	7
74	7
75	3
76	10
77	7
78	5
79	6
80	10
81	4
82	8
83	4
84	6
85	7
86	6
87	8
88	10
89	4
90	6
91	8
92	9
93	5
94	6
95	5
96	7
97	13
98	5
99	5
100	6

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	2
8	2
9	2
10	1
11	4
12	4
13	4
14	2
15	3
16	2
17	3
18	3
19	7
20	4
21	4
22	5
23	3
24	4
25	5
26	5
27	5
28	6
29	7
30	6
31	5
32	4
33	4
34	9
35	3
36	6
37	6
38	5
39	4
40	7
41	1
42	4
43	5
44	6
45	9
46	6
47	8
48	6
49	8
50	4
51	5
52	8
53	7
54	4
55	3
56	4
57	7
58	6
59	6
60	3
61	6
62	5
63	6
64	4
65	6
66	8
67	7
68	8
69	4
70	5
71	3
72	6
73	7
74	7
75	3
76	10
77	7
78	5
79	6
80	10
81	4
82	8
83	4
84	6
85	7
86	6
87	8
88	10
89	4
90	6
91	8
92	9
93	5
94	6
95	5
96	7
97	13
98	5
99	5
100	6

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	2
8	2
9	2
10	1
11	4
12	4
13	4
14	2
15	3
16	2
17	3
18	3
19	7
20	4
21	4
22	5
23	3
24	4
25	5
26	5
27	5
28	6
29	7
30	6
31	5
32	4
33	4
34	9
35	3
36	6
37	6
38	5
39	4
40	7
41	1
42	4
43	5
44	6
45	9
46	6
47	8
48	6
49	8
50	4
51	5
52	8
53	7
54	4
55	3
56	4
57	7
58	6
59	6
60	3
61	6
62	5
63	6
64	4
65	6
66	8
67	7
68	8
69	4
70	5
71	3
72	6
73	7
74	7
75	3
76	10
77	7
78	5
79	6
80	10
81	4
82	8
83	4
84	6
85	7
86	6
87	8
88	10
89	4
90	6
91	8
92	9
93	5
94	6
95	5
96	7
97	13
98	5
99	5
100	6