A213202 - cp's OEIS frontend

A213202 Number of ways to write n = p + sum_{k=1..m}(-1)^(m-k)*p_k, where p is a Sophie Germain prime and p_k is the k-th prime.

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

[0, 0, 1, 2, 2, 3, 3, 2, 2, 3, 1, 2, 2, 2, 3, 2, 1, 3, 2, 1, 3, 1, 3, 5, 2, 2, 3, 2, 3, 4, 4, 4, 2, 3, 3, 3, 3, 2, 1, 2, 4, 5, 4, 4, 4, 2, 3, 3, 4, 4, 3, 2, 1, 4, 6, 6, 4, 4, 4, 4, 4, 4, 4, 2, 3, 3, 5, 6, 2, 2, 1, 4, 4, 5, 3, 3, 1, 2, 5, 4, 5, 5, 2, 4, 5, 7, 2, 5, 1, 5, 4, 4, 4, 6, 3, 2, 6, 4, 5, 4]

cp's OEIS Frontend

A213202 Number of ways to write n = p + sum_{k=1..m}(-1)^(m-k)*p_k, where p is a Sophie Germain prime and p_k is the k-th prime.

Table of values

List of values

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

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

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