A129321 - cp's OEIS frontend

A129321 Triangle where the n-th row is the smallest n positive integers which are coprime to the n-th triangular number (n(n+1)/2).

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

[1, 1, 2, 1, 5, 7, 1, 3, 7, 9, 1, 2, 4, 7, 8, 1, 2, 4, 5, 8, 10, 1, 3, 5, 9, 11, 13, 15, 1, 5, 7, 11, 13, 17, 19, 23, 1, 2, 4, 7, 8, 11, 13, 14, 16, 1, 2, 3, 4, 6, 7, 8, 9, 12, 13, 1, 5, 7, 13, 17, 19, 23, 25, 29, 31, 35, 1, 5, 7, 11, 17, 19, 23, 25, 29, 31, 35, 37, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11]

cp's OEIS Frontend

A129321 Triangle where the n-th row is the smallest n positive integers which are coprime to the n-th triangular number (n(n+1)/2).

Table of values

List of values

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

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

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