A171637 - cp's OEIS frontend

A171637 Triangle read by rows in which row n lists the distinct primes of the distinct decompositions of 2n into unordered sums of two primes.

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

[2, 3, 3, 5, 3, 5, 7, 5, 7, 3, 7, 11, 3, 5, 11, 13, 5, 7, 11, 13, 3, 7, 13, 17, 3, 5, 11, 17, 19, 5, 7, 11, 13, 17, 19, 3, 7, 13, 19, 23, 5, 11, 17, 23, 7, 11, 13, 17, 19, 23, 3, 13, 19, 29, 3, 5, 11, 17, 23, 29, 31, 5, 7, 13, 17, 19, 23, 29, 31, 7, 19, 31, 3, 11, 17, 23, 29, 37, 5, 11]

cp's OEIS Frontend

A171637 Triangle read by rows in which row n lists the distinct primes of the distinct decompositions of 2n into unordered sums of two primes.

Table of values

List of values

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

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

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