A184995 - cp's OEIS frontend

A184995 Irregular triangle T, read by rows, in which row n lists the primes p <= n such that 2n-p is also prime.

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

[2, 3, 3, 3, 5, 5, 3, 7, 3, 5, 5, 7, 3, 7, 3, 5, 11, 5, 7, 11, 3, 7, 13, 5, 11, 7, 11, 13, 3, 13, 3, 5, 11, 17, 5, 7, 13, 17, 7, 19, 3, 11, 17, 5, 11, 13, 19, 3, 7, 13, 3, 5, 17, 23, 5, 7, 11, 17, 19, 3, 7, 13, 19, 5, 11, 23, 7, 11, 13, 17, 23, 3, 13, 19, 5, 11, 17, 29, 7, 13, 17, 19, 23, 29]

cp's OEIS Frontend

A184995 Irregular triangle T, read by rows, in which row n lists the primes p <= n such that 2n-p is also prime.

Table of values

List of values

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

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

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