A154727 - cp's OEIS frontend

A154727 Triangle read by rows in which row n lists all the pairs of prime numbers that are equidistant from n, or only n if there is no such pair, as shown below in the example.

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

[1, 2, 3, 3, 5, 3, 7, 5, 7, 3, 11, 3, 5, 11, 13, 5, 7, 11, 13, 3, 7, 13, 17, 3, 5, 17, 19, 5, 7, 11, 13, 17, 19, 3, 7, 19, 23, 5, 11, 17, 23, 7, 11, 13, 17, 19, 23, 3, 13, 19, 29, 3, 5, 11, 23, 29, 31, 5, 7, 13, 17, 19, 23, 29, 31, 7, 31, 3, 11, 17]

cp's OEIS Frontend

A154727 Triangle read by rows in which row n lists all the pairs of prime numbers that are equidistant from n, or only n if there is no such pair, as shown below in the example.

Table of values

List of values

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

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

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