A209254 - cp's OEIS frontend

A209254 Number of ways to write 2n-1 = p+q with q practical, p and p^4+q^4 both prime.

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

[0, 1, 1, 2, 2, 2, 3, 1, 2, 2, 3, 2, 4, 3, 1, 3, 1, 1, 4, 2, 5, 5, 1, 4, 1, 2, 4, 3, 1, 6, 3, 4, 4, 5, 1, 6, 7, 2, 4, 3, 4, 2, 4, 5, 1, 2, 3, 7, 5, 2, 4, 8, 4, 6, 5, 1, 2, 2, 3, 8, 3, 1, 5, 6, 2, 4, 7, 4, 8, 4, 2, 7, 6, 3, 4, 3, 1, 6, 6, 1, 7, 6, 2, 8, 9, 5, 7, 3, 3, 10, 7, 3, 9, 14, 1, 9, 4, 3, 4, 6]

cp's OEIS Frontend

A209254 Number of ways to write 2n-1 = p+q with q practical, p and p^4+q^4 both prime.

Table of values

List of values

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

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

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