A259940 - cp's OEIS frontend

A259940 Let A={A005574(n)}, the set of all numbers n for which n^2+1 is prime. The sequence lists the number of decompositions A005574(n) = A005574(n1) + A005574(n2) for some n1, n2 and every A005574(n)>1.

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

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

cp's OEIS Frontend

A259940 Let A={A005574(n)}, the set of all numbers n for which n^2+1 is prime. The sequence lists the number of decompositions A005574(n) = A005574(n1) + A005574(n2) for some n1, n2 and every A005574(n)>1.

Table of values

List of values

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

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

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