A219838 - cp's OEIS frontend

A219838 Number of ways to write n as x + y with 0 < x <= y and (xy)^2 + xy + 1 prime.

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

[0, 1, 1, 1, 1, 2, 2, 2, 3, 2, 1, 2, 1, 2, 3, 1, 1, 3, 2, 2, 6, 4, 1, 3, 3, 4, 4, 4, 4, 4, 2, 2, 5, 4, 2, 4, 2, 4, 3, 5, 5, 8, 1, 2, 6, 2, 4, 13, 1, 8, 8, 3, 3, 9, 5, 4, 8, 5, 3, 9, 5, 4, 17, 9, 2, 6, 5, 5, 9, 10, 7, 13, 5, 3, 6, 12, 8, 10, 6, 5, 8, 10, 11, 12, 9, 10, 8, 6, 6, 11, 7, 11, 5, 5, 4, 15, 14, 12, 14, 9]

cp's OEIS Frontend

A219838 Number of ways to write n as x + y with 0 < x <= y and (xy)^2 + xy + 1 prime.

Table of values

List of values

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

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

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