A209777 - cp's OEIS frontend

A209777 Number of q in the range 0<=q<=n for which k(n)+k(q) is prime, with k(n) := n*(n+1)^2/2.

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

[1, 1, 0, 1, 0, 2, 1, 0, 0, 3, 0, 1, 2, 0, 0, 2, 1, 3, 1, 0, 0, 9, 1, 0, 2, 2, 0, 2, 1, 2, 4, 0, 0, 6, 1, 1, 5, 4, 1, 3, 2, 3, 2, 0, 0, 15, 0, 2, 2, 3, 3, 7, 1, 4, 2, 1, 3, 17, 2, 1, 6, 5, 1, 4, 2, 8, 3, 0, 0, 7, 2, 3, 9, 3, 1, 2, 0, 9, 1, 0, 2, 21, 1, 4, 6, 9, 2, 5, 2, 4, 6, 3, 3, 16, 2, 2, 4, 5, 1, 2]

cp's OEIS Frontend

A209777 Number of q in the range 0<=q<=n for which k(n)+k(q) is prime, with k(n) := n*(n+1)^2/2.

Table of values

List of values

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

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

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