A210533 - cp's OEIS frontend

A210533 Number of ways to write 2n = x+y (x,y>0) with x-1 and x+1 both prime, and x and x^3+y^3 both practical.

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

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

cp's OEIS Frontend

A210533 Number of ways to write 2n = x+y (x,y>0) with x-1 and x+1 both prime, and x and x^3+y^3 both practical.

Table of values

List of values

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

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

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