A230254 - cp's OEIS frontend

A230254 Number of ways to write n = p + q with p and (p+1)*q/2 + 1 both prime.

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

[0, 0, 0, 1, 1, 2, 1, 2, 2, 2, 3, 2, 1, 4, 1, 2, 5, 2, 3, 2, 3, 4, 4, 3, 4, 4, 2, 2, 8, 1, 6, 6, 2, 3, 2, 3, 5, 5, 5, 1, 5, 3, 7, 5, 1, 7, 10, 1, 3, 4, 8, 5, 3, 3, 3, 5, 8, 4, 10, 2, 9, 3, 3, 4, 7, 5, 9, 5, 4, 3, 15, 4, 12, 7, 4, 5, 9, 3, 11, 4, 6, 5, 9, 5, 6, 12, 6, 5, 8, 1, 4, 8, 5, 13, 9, 2, 6, 5, 8, 4]

cp's OEIS Frontend

A230254 Number of ways to write n = p + q with p and (p+1)*q/2 + 1 both prime.

Table of values

List of values

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

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

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