A178431 - cp's OEIS frontend

A178431 Joint-rank array of the sums of two primes.

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

[1, 2, 2, 4, 3, 4, 6, 5, 5, 6, 9, 7, 7, 7, 9, 11, 10, 8, 8, 10, 11, 14, 12, 12, 10, 12, 12, 14, 16, 15, 13, 13, 13, 13, 15, 16, 19, 17, 17, 15, 17, 15, 17, 17, 19, 23, 20, 18, 18, 18, 18, 18, 18, 20, 23, 25, 24, 21, 20, 21, 20, 21, 20, 21, 24, 25]

cp's OEIS Frontend

A178431 Joint-rank array of the sums of two primes.

Table of values

List of values

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

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

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