A088643 - cp's OEIS frontend

A088643 Triangle read by rows: row n >= 1 is obtained as follows. Start with n, next term is always largest number m with 1 <= m < n which has not yet appeared in that row and such that m + previous term in the row is a prime. Stop when no further m can be found.

n	a(n)
1	1
2	2
3	1
4	3
5	2
6	1
7	4
8	3
9	2
10	1
11	5
12	2
13	3
14	4
15	1
16	6
17	5
18	2
19	3
20	4
21	1
22	7
23	6
24	5
25	2
26	3
27	4
28	1
29	8
30	5
31	6
32	7
33	4
34	3
35	2
36	1
37	9
38	8
39	5
40	6
41	7
42	4
43	3
44	2
45	1
46	10
47	9
48	8
49	5
50	6
51	7
52	4
53	3
54	2
55	1
56	11
57	8
58	9
59	10
60	7
61	6
62	5
63	2
64	3
65	4
66	1
67	12
68	11
69	8
70	9
71	10
72	7
73	6
74	5
75	2
76	3
77	4
78	1
79	13
80	10
81	9
82	8
83	11
84	12
85	7
86	6
87	5
88	2
89	3
90	4
91	1
92	14
93	9
94	10
95	13
96	6
97	11
98	12
99	7
100	4
101	3
102	8
103	5
104	2
105	1

[1, 2, 1, 3, 2, 1, 4, 3, 2, 1, 5, 2, 3, 4, 1, 6, 5, 2, 3, 4, 1, 7, 6, 5, 2, 3, 4, 1, 8, 5, 6, 7, 4, 3, 2, 1, 9, 8, 5, 6, 7, 4, 3, 2, 1, 10, 9, 8, 5, 6, 7, 4, 3, 2, 1, 11, 8, 9, 10, 7, 6, 5, 2, 3, 4, 1, 12, 11, 8, 9, 10, 7, 6, 5, 2, 3, 4, 1, 13, 10, 9, 8, 11, 12, 7, 6, 5, 2, 3, 4, 1, 14, 9, 10, 13, 6, 11, 12, 7, 4, 3, 8, 5, 2, 1]

cp's OEIS Frontend

A088643 Triangle read by rows: row n >= 1 is obtained as follows. Start with n, next term is always largest number m with 1 <= m < n which has not yet appeared in that row and such that m + previous term in the row is a prime. Stop when no further m can be found.

Table of values

List of values

n	a(n)
1	1
2	2
3	1
4	3
5	2
6	1
7	4
8	3
9	2
10	1
11	5
12	2
13	3
14	4
15	1
16	6
17	5
18	2
19	3
20	4
21	1
22	7
23	6
24	5
25	2
26	3
27	4
28	1
29	8
30	5
31	6
32	7
33	4
34	3
35	2
36	1
37	9
38	8
39	5
40	6
41	7
42	4
43	3
44	2
45	1
46	10
47	9
48	8
49	5
50	6
51	7
52	4
53	3
54	2
55	1
56	11
57	8
58	9
59	10
60	7
61	6
62	5
63	2
64	3
65	4
66	1
67	12
68	11
69	8
70	9
71	10
72	7
73	6
74	5
75	2
76	3
77	4
78	1
79	13
80	10
81	9
82	8
83	11
84	12
85	7
86	6
87	5
88	2
89	3
90	4
91	1
92	14
93	9
94	10
95	13
96	6
97	11
98	12
99	7
100	4
101	3
102	8
103	5
104	2
105	1

n	a(n)
1	1
2	2
3	1
4	3
5	2
6	1
7	4
8	3
9	2
10	1
11	5
12	2
13	3
14	4
15	1
16	6
17	5
18	2
19	3
20	4
21	1
22	7
23	6
24	5
25	2
26	3
27	4
28	1
29	8
30	5
31	6
32	7
33	4
34	3
35	2
36	1
37	9
38	8
39	5
40	6
41	7
42	4
43	3
44	2
45	1
46	10
47	9
48	8
49	5
50	6
51	7
52	4
53	3
54	2
55	1
56	11
57	8
58	9
59	10
60	7
61	6
62	5
63	2
64	3
65	4
66	1
67	12
68	11
69	8
70	9
71	10
72	7
73	6
74	5
75	2
76	3
77	4
78	1
79	13
80	10
81	9
82	8
83	11
84	12
85	7
86	6
87	5
88	2
89	3
90	4
91	1
92	14
93	9
94	10
95	13
96	6
97	11
98	12
99	7
100	4
101	3
102	8
103	5
104	2
105	1

n	a(n)
1	1
2	2
3	1
4	3
5	2
6	1
7	4
8	3
9	2
10	1
11	5
12	2
13	3
14	4
15	1
16	6
17	5
18	2
19	3
20	4
21	1
22	7
23	6
24	5
25	2
26	3
27	4
28	1
29	8
30	5
31	6
32	7
33	4
34	3
35	2
36	1
37	9
38	8
39	5
40	6
41	7
42	4
43	3
44	2
45	1
46	10
47	9
48	8
49	5
50	6
51	7
52	4
53	3
54	2
55	1
56	11
57	8
58	9
59	10
60	7
61	6
62	5
63	2
64	3
65	4
66	1
67	12
68	11
69	8
70	9
71	10
72	7
73	6
74	5
75	2
76	3
77	4
78	1
79	13
80	10
81	9
82	8
83	11
84	12
85	7
86	6
87	5
88	2
89	3
90	4
91	1
92	14
93	9
94	10
95	13
96	6
97	11
98	12
99	7
100	4
101	3
102	8
103	5
104	2
105	1