A235649 - cp's OEIS frontend

A235649 Define a(4)=3 then a(n+1)is the smallest prime P such that a(n)<=P< n with 2n-P=Q prime and if not possible a(n+1) is the smallest prime P such that P with 2n-P=Q prime.

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

[3, 3, 5, 3, 3, 5, 7, 3, 5, 7, 11, 11, 13, 3, 5, 7, 11, 11, 13, 17, 17, 19, 23, 23, 3, 5, 7, 19, 23, 23, 31, 3, 5, 7, 17, 17, 19, 23, 23, 3, 5, 7, 13, 23, 23, 31, 41, 41, 43, 47, 47, 3, 3, 5, 7, 11, 11, 13, 17, 17, 19, 23, 23, 31, 47, 59, 61, 3, 5, 7, 11]

cp's OEIS Frontend

A235649 Define a(4)=3 then a(n+1)is the smallest prime P such that a(n)<=P< n with 2n-P=Q prime and if not possible a(n+1) is the smallest prime P such that P with 2n-P=Q prime.

Table of values

List of values

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

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

cp's OEIS Frontend

A235649 Define a(4)=3 then a(n+1)is the smallest prime P such that a(n)<=P< n with 2*n-P=Q prime and if not possible a(n+1) is the smallest prime P such that P with 2*n-P=Q prime.

Table of values

List of values

A235649 Define a(4)=3 then a(n+1)is the smallest prime P such that a(n)<=P< n with 2n-P=Q prime and if not possible a(n+1) is the smallest prime P such that P with 2n-P=Q prime.

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